Miyajima Aquarium Visitor Guide Travel Guide

About Miyajima Aquarium (Miyaji Marin)

The aquarium's address is 10-3 Miyajima-cho, Hatsukaichi City, Hiroshima Prefecture. Because it sits inside a national park, the architects gave it a Japanese-style design with curved roof tiles and warm wood tones that blend naturally with the island's historic landscape. Inside, the layout is compact and easy to navigate, with elevators connecting all floors and pathways wide enough for strollers and wheelchairs.

Four animals anchor the experience: the finless porpoise (sunameri), sea lions, Humboldt penguins, and small-clawed otters. The finless porpoise holds the greatest significance — it appears in the aquarium's official logo, and Miyaji Marin holds the world record for the first third-generation captive birth of this species. Beyond the headliners, the exhibits cover horseshoe crabs, moray eels, oyster-farming displays, and a rotating cast of Seto Inland Sea species.

One practical detail worth knowing from the start: the aquarium offers a same-day re-entry stamp. You can spend the morning inside, step out for lunch and a shrine visit, then return in the afternoon without paying again. Local families use this structure routinely. It turns a half-day stop into a natural anchor for a full island day.

Hours, Tickets, and Essential Visitor Information

Standard opening hours are 09:00 to 17:00, with last entry at 16:00. During certain summer dates the aquarium extends closing to 18:00 — check the official website for the specific extended-hours calendar. The facility is closed from 26 to 30 December each year.

Tickets are sold at the aquarium entrance window. A faster option: buy a voucher at a convenience store terminal — Seven-Eleven, Lawson, or FamilyMart all sell them 24 hours a day. Present the voucher at the gate and walk straight in without queuing. On busy weekends and Golden Week this saves a noticeable amount of time. Visitors holding certain disability certificates receive reduced admission, and one accompanying companion enters free.

One cost that surprises many first-timers: since October 2023, Miyajima Island charges a separate ¥100 visitor tax per person when you board the ferry. This is collected at the ferry terminal, not at the aquarium, and applies to every visit — even if you use the re-entry stamp to leave and return by land on the same island day. Factor it into your total budget alongside the aquarium ticket.

The Star of the Show: The Finless Porpoise (Sunameri)

The finless porpoise is the undisputed mascot of Miyaji Marin. Measuring 160 to 190 centimetres in length and weighing between 60 and 80 kilograms, they are compact compared to other cetaceans, but their rounded melon-shaped forehead and permanently upturned expression give them an extraordinarily endearing appearance. No other aquarium in the world has bred a third generation of this species in captivity — that distinction belongs entirely to Miyajima.

These animals are naturally curious. It is not unusual to see a porpoise swim directly toward the viewing glass and linger there, a behaviour keepers attribute to their genuine interest in human visitors. They also communicate through clicks and squeaks audible if you press your ear close to the tank. The exhibit includes a partial backstage viewing area where you can watch daily care routines — feeding, health checks, and enrichment activities — through large windows. For the clearest observations, keep voices calm near the enclosure and turn off your camera flash. To learn more about the species globally, consult the finless porpoise on Wikipedia for broader conservation and behavioral context.

The Sea Lion Show: Daily Live Performances

The sea lion show is held three times daily on weekdays at 10:30, 13:00, and 15:30. Each performance runs about 15 minutes. The sea lions demonstrate ring tosses, ball balancing, and crowd interactions that draw genuine reactions from visitors of all ages. No reservation is required — the show is included in your standard admission price.

Arrive at the Live Pool stadium at least 10 to 15 minutes early to secure a seat. The front rows near the pool edge are prime splashing territory, so choose a middle-section seat if you want the best view without getting soaked. On crowded days, entry to the viewing area may be briefly controlled before showtime — early arrival solves this. Always check the in-house bulletin boards on the day of your visit, as show times can adjust or be cancelled without advance notice.

The Penguin Pool: Where Cuteness Peaks

Among all the exhibits at Miyajima Aquarium, the Humboldt penguin area consistently stops visitors in their tracks. Watch the penguins lounge lazily on rocky banks, then launch themselves into the water and glide effortlessly — the contrast between their waddling gait on land and their streamlined swimming is reliably entertaining. The colony tends to look relaxed and unbothered by human visitors, giving you unhurried time to watch at your own pace. The Humboldt penguin species is native to South American waters, making these exhibits a remarkable cross-ocean bridge.

The viewing setup runs on two levels. The first-floor pool lets you watch the penguins seemingly fly beneath you through underwater viewing panels. The second floor gives a top-down view of nesting and social behaviour on the rocks. The Humboldt penguins breed from December through late June — visiting between late winter and spring may coincide with chicks alongside their parents. If feeding time lines up with your visit, a keeper narration often accompanies it. Free stroller rental is available from the aquarium entrance, a practical perk worth using on busy days when the railings fill up with adults.

Marine Exhibits: A Tour Through the Seto Inland Sea

The exhibits are organised around the ecosystems and culture of the Seto Inland Sea. The first floor covers tidal flats, an oyster-farming display complete with actual raft replicas, the finless porpoise habitat, the sea lion and penguin areas, and the Live Pool stage. The oyster exhibit explains why Hiroshima produces more oysters than any other region in Japan — a point children often recognise from school lessons. A living horseshoe crab exhibit on this floor surprises many visitors: these ancient creatures have existed essentially unchanged for hundreds of millions of years, and seeing full-sized specimens up close has real impact.

The second floor shifts to a more immersive perspective with overhead viewing windows that let you look down into tanks from above, plus a behind-the-scenes section for finless porpoise care. A large central tank on this level houses sea bream, rays, and small schooling fish swimming together — a peaceful panoramic scene that rewards slow watching. The quietest time to visit the most popular exhibits is typically between 14:00 and 16:00 on weekdays. Check out the Miyajima oysters guide after your visit to follow the aquarium's oyster display with a taste of the real thing at lunch.

Inside the Aquarium: Facilities and Atmosphere

The interior is clean, well-lit, and pleasantly spacious. In winter the building is comfortably heated, a welcome relief after a cold ferry crossing. Restrooms are clean and rarely overcrowded, and nearly every public bathroom includes a diaper-changing station. The compact layout means children rarely tire before seeing the main highlights. Photography and personal video recording are welcome throughout; switch off your flash near animal enclosures to avoid startling them. For real-time hours, seasonal programs, and ticket details, visit the official Miyajima Aquarium site.

The second-floor restaurant, Miyaji Marin Kitchen, serves a rotating menu of original dishes with views over the Seto Inland Sea. Popular items include Hiroshima-style oyster dishes and local seafood sets — the kind of meal that feels like a natural extension of what you just saw in the tanks below. Eating inside the exhibit areas is not permitted, so use the designated dining and rest zones. The museum shop near the exit is well-curated and reasonably priced; finless porpoise plushies and penguin accessories are perennial bestsellers.

Seasonal Events and Special Programs

Miyajima Aquarium runs daily and seasonal programming year-round. Regular daily events include the sea lion live show, penguin interaction time, feeding demonstrations for otters, sea lions, and fish, and a weekday-only archerfish shooting exhibition. Short species-focused talks run throughout the week on the educational circuit.

During summer (1 July through 30 September), the aquarium opens its outdoor "Jabujubu" wading pool, where visitors step into a shallow tank and interact with small fish and marine creatures directly. It is one of the most popular activities for younger children. Bring a change of clothes and a towel if you plan to participate. In 2026, the aquarium is expected to continue its pattern of special evening Night Aquarium sessions with keeper-led commentary and bioluminescence demonstrations using sea fireflies (uminotama). Spaces are awarded by application; check the official website early as capacity is extremely limited.

How Long to Spend and When to Visit

Plan on one and a half to two hours for a comfortable, unhurried visit. With the same-day re-entry stamp, many visitors do what local families do: spend the morning at the aquarium, head out for lunch and a shrine visit at midday, then return in the afternoon at a calmer pace. This structure makes the aquarium a natural anchor for a full day on the island without any feeling of rush.

The aquarium gets extremely busy during Japan's major holiday periods: Golden Week (late April to early May), the Obon period in mid-August, Silver Week in September, and New Year. The November three-day national holiday weekends are considered the most crowded single stretch of the year because they overlap with Miyajima's autumn foliage season. Late March through early April is also very busy due to spring break. A regular weekday outside these windows offers a far more comfortable experience. The calmest window within any given day is 14:00 to 16:00. If you are visiting in August, avoid the evening of 14 August — the island's famous fireworks display draws extraordinary crowds that make navigation difficult even hours before the show.

Getting There: Access and Walking Routes from Itsukushima Shrine

From Miyajima Pier, the aquarium is a roughly 25-minute walk along the coast. If you are coming from Itsukushima Shrine, the walk is only about five minutes — simply follow the signs toward the western end of the village. The route passes several traditional houses and small shops and is mostly flat, accessible for families with strollers. Walking remains the most enjoyable way to reach the aquarium and lets you enjoy the sea breeze and sightlines along the way.

The aquarium suggests two named scenic routes. The Sunameri Route (Cultural Heritage Walk) passes Daigan-ji Temple, along the Mitarashi River bridge, through the Nishi-Matsuba pine grove, and past Kiyomori Shrine before arriving at the aquarium — atmospheric and photogenic. The Penguin Route (Museum and Heritage Walk) leads through the Miyajima Treasure House and the Miyajima History and Folk Museum, housed in a preserved merchant townhouse — a better choice on rainy days due to its indoor focus.

After your visit, the Daisho-in Temple is a short walk from the aquarium exit and offers one of the island's most intricate temple complexes. For more Hiroshima attractions beyond the island, the Peace Memorial Museum and Hiroshima Castle make a strong full-day complement on a separate day.

How to Plan a Smooth Miyajima Aquarium Day

Arrive on the island early to beat the largest tour groups. Visit Itsukushima Shrine first, ideally at or near high tide when the torii gate appears to float. Check the aquarium's sea lion show times as soon as you enter the building — the 10:30 show is the least crowded. Use the re-entry stamp when you leave for lunch; the Miyajima Omotesando shopping street runs between the ferry pier and the shrine and is the natural place for a midday break.

Wear comfortable shoes — you will be on your feet for several hours. Lockers are available at the ferry terminal for storing heavy bags before you start walking. Staying hydrated matters, especially during the humid summer months. If you plan to visit the Jabujubu wading pool in summer, pack a small towel and a change of clothes for the children. For overnight options, check our guide on where to stay in Miyajima — staying on the island lets you reach the aquarium right at 09:00 before the ferry crowds arrive. Jukeiso on Miyajima Island runs a shuttle from the ferry terminal and is a strong choice for the ryokan experience near the aquarium.