What Is Onigashima Cave? The Momotarō Legend on Megijima Island
Onigashima Cave (Onigashima Daidōkutsu), located on Megijima Island in Takamatsu City, Kagawa Prefecture, is a spot where you can experience both the world of the Momotarō legend and the atmosphere of cave exploration at the same time.
Megijima is also known as "Onigashima" (Demon Island), and although it is only about a 20-minute ferry ride from Takamatsu Port, you start to feel as if you are stepping into the setting of an old Japanese folktale from the moment you set off for the island.
Rather than focusing on the cave alone, walking around the port, along the island roads, and up to the viewpoints while feeling the sea breeze helps overseas travelers connect more easily with Japan's storytelling culture.
Why Megijima Is Called Onigashima (Demon Island)
Megijima has long been associated with a legend describing it as the home of the demons (oni) that appear in the Momotarō tale, and tourist guides also introduce it under the alternate name "Onigashima."
Even without a detailed knowledge of Japanese folktales, picturing the story of Momotarō setting out to defeat the demons makes it easier to appreciate the exhibits inside the cave and the meaning behind the place names.
Onigashima Cave on the Slopes of Mount Washigamine
According to the Onigashima Tourism Association and Kagawa Prefecture's tourism guides, the cave is located in the central part of the island, on the slopes of Mount Washigamine, which stands 188 meters high.
It is described as covering 4,000 square meters with a depth of 400 meters, and inside you'll find re-creations such as the demons' great hall, living quarters, and the demon guard's waiting room.
The cave is said to have been created around 100 BC, and one of its highlights is how the Momotarō legend has been layered onto this ancient rock space over the centuries.
Useful Words to Learn Before Your Trip
Knowing a few place names and facility names in advance makes it easier to find your way when you see signs at the port or markers around the island.
Learning both the Japanese names and their romanized forms will also come in handy when using map apps or searching online.
Here are some words you're likely to come across near the cave, organized in a form that's easy to use while traveling.
| Word | Reading | Meaning |
|---|---|---|
| 女木島 | Megijima | Name of the island |
| 鬼ヶ島 | Onigashima | Alternate name |
| 鷲ヶ峰 | Washigamine | Name of the mountain (188 m high) |
| おにの館 | Onino-yakata | Hub at the port |
Top Things to See at Onigashima Cave: Walking Through the Story
At Onigashima Cave, it's not only the natural darkness and the texture of the rock that shape your impression of the trip, but also the re-created exhibits that bring the demons' way of life to mind.
Rather than simply viewing the displays one by one, walking through with the feeling of "entering the demons' world" from the Momotarō story makes even a short visit more memorable.
Picturing the Demons' Great Hall
Inside the cave, spaces such as the demons' great hall and living quarters are re-created to evoke scenes where the demons once gathered.
Walking through as if reading a grand story turns the experience into something more than just viewing exhibits, making you feel as if you've stepped into the backdrop of an old folktale.
Look Out for the Demon Guard's Waiting Room
The name "demon guard's waiting room" conjures up the image of a being that protects the cave.
In Japanese folktales, fear and humor often coexist, and you can sense that atmosphere in the demons' expressions and their arrangement here.
The Cool Air Inside the Cave, Even in Summer
Kagawa Prefecture's official tourism guide notes that the inside of the cave stays cool even in summer, with an eerie, mysterious atmosphere drifting through.
Feeling the contrast between the sea breeze and sunshine outside and the darkness and coolness inside the cave makes the island's terrain and the changes in space all the more striking.
The time needed to walk through the cave is around 20 to 30 minutes, and taking it slowly lets you savor the lingering atmosphere of the story.
Photos That Capture Scenes from the Story
When taking photos, including the rock surfaces and the depth of the passageways rather than just a close-up of the demon statues conveys the true feel of the cave.
In dark areas, it's important to pause where you won't block others walking by and to keep a distance that won't damage the exhibits or passageways.
Getting Ready at Megi Port Before Heading to Onigashima Cave
A trip to Onigashima Cave begins the moment you arrive at Megi Port.
Checking the information around Megi Port and sorting out your belongings and footwear before heading toward the cave makes getting around the island much smoother.
Make Onino-yakata Your Starting Point
Onino-yakata, located at the port, is introduced as a hub for exploring the island that also serves as the ferry waiting area.
Since it's an easy place to check information on getting to the cave and walking around the island, stopping by right after you arrive helps you plan out the flow of your day.
The Shuttle Bus Runs to Match Ferry Arrivals
According to the Onigashima Tourism Association, a shuttle bus runs between Onino-yakata at the port and the cave, timed to match the ferry arrivals.
The shuttle bus fare is 1,000 yen round trip for adults and 500 yen for children, and one way is 700 yen for adults and 300 yen for children.
Because island transport can be affected by weather and operating conditions, it's reassuring to check local information and official sources before you set off.
Pack for the Cave
Since the cave is dark and the footing changes, comfortable walking shoes and bags that keep your hands free are best.
Walking through narrow spaces while carrying large luggage makes it harder for both you and those around you to move, so traveling light from the port makes for a more comfortable visit.
Here are some items worth reviewing before you head out, organized by the purpose of each preparation.
| Item | Approach | Reason |
|---|---|---|
| Shoes | Easy to walk in | For the footing |
| Luggage | Keep it light | Easier in passageways |
| Clothing | Easy to adjust | For temperature changes |
| Schedule | Allow extra time | Suited to island travel |
How to Get to Onigashima Cave: Access and Transport Information
To reach Onigashima Cave, the basic route is to take a ferry from Takamatsu Port to Megijima Island, then head from Megi Port by shuttle bus or on foot.
Since you'll be connecting between the ferry and island transport, planning all the way through to the time of your return ferry lets you spend your time on the island at a relaxed pace.
Ferry from Takamatsu Port to Megijima
From Takamatsu Port, it's about a 20-minute ferry ride to Megijima on the ferry operated by Meojima Shipping Co., Ltd.
Since there are only a few round trips per day, it's reassuring to check the ferry timetable before setting off and align your cave visit with the time of your return ferry.
Getting from Megi Port to the Cave
From Megi Port, you can reach the cave by the shuttle bus that runs in time with ferry arrivals.
If you walk, it takes about 30 minutes including some uphill sections, so it's best to choose your mode of transport based on your energy level and the weather.
Cave Entrance Fee and Opening Hours
The cave entrance fee is 600 yen for adults (high school students and older), 300 yen for children (elementary and junior high students), and 500 yen for those aged 65 and over.
Opening hours are 8:35 a.m. to 4:55 p.m. (last admission at 4:40 p.m.), and the cave is open year-round.
Since fees and timetables can vary depending on the season and operating conditions, please check official information from the Onigashima Tourism Association and others before your visit.
Tips and Etiquette for Walking Through the Cave
Onigashima Cave is a tourist spot, but it's also a place where you'll want to walk with care for the darkness and the width of the passageways.
Knowing the etiquette lets you enjoy the exhibits at ease while leaving a pleasant experience for other travelers as well.
Walk Slowly While Watching Your Step
Inside the cave, your eyes may take a moment to adjust right after coming in from the bright outdoors.
Walking without rushing, while keeping an eye on your footing and the movements of people ahead, makes it easier to tour the cave safely.
Keep Your Distance from the Exhibits
The demon statues and re-created exhibits are important elements that create the atmosphere of the story.
By not touching or leaning on them, and by stepping back a little when composing your photos, you make it easier for those around you to see as well.
Be Mindful of Your Voice and Lights
Sound carries easily in the cave, and strong light can easily enter others' field of vision.
Keeping conversation low and avoiding pointing lights or smartphones at others makes for a calmer visit.
Here are the behaviors to keep in mind inside the cave, divided into what's fine and what's best avoided.
| Situation | OK | Best Avoided |
|---|---|---|
| Walking | Go slowly | Running |
| Photos | Keep it brief | Blocking passageways |
| Exhibits | View from a distance | Touching |
| Conversation | Keep it quiet | Loud voices |
Things to Do on Megijima Beyond the Cave
If you're visiting Onigashima Cave, savoring some of Megijima's scenery before and after the cave gives your trip a sense of completeness as a Seto Inland Sea island journey.
The flow from the world of folktales to the sea views makes this spot's appeal feel even more layered.
Take In the Views and the Seto Inland Sea
The area around the cave is near Mount Washigamine at 188 meters, and on clear days the scenery of the Seto Inland Sea adds to the impression of your trip.
Seeing the bright sea after walking through the dark space inside the cave heightens the sense of your view opening up.
Try Kibidango Near the Cave
The souvenir shop near the cave is said to offer kibidango (sweet millet dumplings), which are familiar from the Momotarō story.
Enjoying a flavor tied to the story along the way deepens the impression of the experience as a cultural one.
Sense the Island's Character Around Megi Port
The area around Megi Port is a place where you can sense the island's atmosphere even while waiting for the ferry.
Walking while taking in the tourist information, the port buildings, and the seaside scenery lets you touch the everyday life of Megijima that you can't see from the cave alone.
Share the Story with Family and Friends
Since Momotarō is a folktale widely known in Japan, chatting about the characters and the image of the demons along the way makes it easier to enjoy as a cultural experience.
If you're traveling with children, walking together to look for the demons' expressions and the details of the exhibits, without overemphasizing the scary parts, makes it more approachable.
Savor Island Time Without Rushing
On a remote island, the travel and waiting times become part of the journey too.
Rather than packing your schedule too tightly, leaving room for waiting at the port and time to feel the sea breeze creates the lingering charm that's unique to Megijima.
Enjoying Onigashima Cave by Season and Weather
Inside and outside the cave, the brightness and how it feels change.
Adjusting your clothing and how you walk to suit the season and weather makes it easier to enjoy both the cave tour and the island walk.
Be Mindful of Temperature Differences in Hot Seasons
Since the cave is said to stay cool even in summer, it's a place where you'll easily notice the difference from the heat outside.
Going in while sweaty can leave you feeling chilly, so bringing a light layer makes it easier to adjust.
Enjoy the Cherry Blossom and Art Festival Seasons Too
Megijima's liveliness changes with the seasons, such as during the cherry blossom season in spring and the Setouchi Triennale, an art festival held once every three years.
Demon-tile (onigawara) artworks related to the Setouchi Triennale can be seen in and around the cave, and the way you enjoy walking the island broadens depending on when you visit.
Take Care When Getting Around on Rainy or Windy Days
On the island, the weather changes the impression of the footing and the sea transport.
On days when rain or wind is a concern, it's reassuring to act while checking local information, taking into account not just the cave but also getting around from the port and your return journey.
Make the Most of Light and Shadow in Your Photos
In the cave it's the darkness, and outside it's the brightness of the sea and sky, that shape the impression.
Even on the same day, the mood of your photos changes inside the cave, near the exit, and at the viewpoints, so being conscious of the differences in light adds variety to your travel record.
Here are the points to keep in mind by season and weather, organized from both the cave tour and the island walk.
| Conditions | Inside the Cave | Island Walk |
|---|---|---|
| Hot days | Guard against chill | Stay hydrated |
| Rainy days | Watch your footing | Beware of slipping |
| Windy days | Stay calm | Check ferry operations |
| Sunny days | Light and shadow | Enjoy the views |
Summary: Enjoy the Story and Island Time at Onigashima Cave
Onigashima Cave is a spot where you can experience the Momotarō legend passed down on Megijima Island, together with its exhibits, spaces, and island scenery.
Viewing the re-created exhibits such as the demons' great hall and living quarters as part of a story makes them memorable even for overseas travelers unfamiliar with Japanese folktales.
Its convenient location, only about a 20-minute ferry ride from Takamatsu Port, is another draw, and by keeping the entrance fee, opening hours, and shuttle bus schedule in mind, you can savor a Seto Inland Sea island trip in as little as half a day.
Before your visit, check official information on operating status, entrance fees, and island transport, and at the site, walking with care for your footing and those around you lets you enjoy both the cave exploration and a Seto Inland Sea island journey at a relaxed pace.
