Located at Hitachinaka City, [Hiraiso (Hiraiso) Beach] is a rare beach in Japan—surrounded by sturdy seawalls—that resembles a “natural pool with calm waters.”Thanks to its unique topography, it’s known as an ideal summer spot for families with young children and international tourists looking to enjoy the ocean in peace.
In this article, we’ll reveal the secrets behind “Daichan the Whale”—the symbol of Hiraiso—along with a forecast for swimming conditions in the summer of 2026.
The Star of Hiraiso Beach | “Daichan the Whale” Floating in the Sea
What has made Hiraiso Beach famous overnight is the giant orange whale floating on the ocean, commonly known as “Daichan the Whale.”
- Water Slide: During the summer, Da-chan plays a major role as a floating water slide. The exhilarating feeling of diving into the ocean from its back creates unforgettable summer memories for children.
- Resting on the Sandy Beach: Actually, Da-chan floats in the ocean only during the swimming season (mid-July to late August).During the off-season, he is hauled up onto the sandy beach, where he quietly “rests.” Taking a photo with Da-chan on the beach is a privilege reserved for travelers visiting from fall through spring. You’ll discover a somewhat endearing expression that’s quite different from his appearance when floating in the ocean.
[Summer 2026] Hiraiso Beach Opening Schedule
In 2026, the season runs from Saturday, July 18, to Sunday, August 23. Lifeguard hours are from 8:00 a.m. to 4:00 p.m.
Beach huts will be open during this period, where you can enjoy yakisoba, shaved ice, and other treats.
A unique way to enjoy Hiraiso Beach, known for its calm waves
Hiraiso Due to its topography, this beach offers a calm environment that sets it apart from other open coastlines.
- An environment like a “natural pool” surrounded by breakwaters Its most distinctive feature is that, because it is protected by sturdy breakwaters on all sides, it is less affected by the open ocean and rarely has rough waves. The risk of being swept away by waves is relatively low, so even when spending time at the water’s edge with small children, you can relax and enjoy the ocean.
- Exploring the rocky shore to observe marine life: A rocky shore stretches right next to the sandy beach. In the tide pools that appear at low tide, you can observe creatures such as crabs and small fish up close. Beyond just swimming, you can enjoy the valuable experience of learning about Japan’s rich natural environment while searching for marine life along the rocky shore.
Advice for International Visitors | How to Stay Safe at Hiraiso Beach
Check out the local rules to make the most of the calm waters at Hiraiso.
- Lifeguards and Announcements: Lifeguards are on duty during the beach’s operating season, and safety announcements are made in foreign languages.
- Health and Safety: Swimming after drinking alcohol is strictly prohibited. Also, be sure to stay hydrated and take breaks to protect yourself from Japan’s strong summer sun.
- Etiquette: Open flames (BBQs) and overnight stays on the beach are prohibited. Please take your trash home with you to help preserve this beautiful natural environment for future generations.
Hiraiso Accommodations and Campgrounds Near the Beach
The Hiraiso and Ajigaura areas offer a variety of attractive accommodations to suit your travel style.
- Nearby Accommodations: Right next to the beach, you’ll find “minshuku” (guesthouses) and “ryokan” (traditional inns) where you can enjoy fresh local seafood. Spending time in a tatami-mat room listening to the sound of the waves is a valuable experience that lets you truly immerse yourself in Japanese culture.
- Camping & Glamping: If you venture a bit further toward the nearby Ajigaura area, you’ll find plenty of camping facilities where you can feel the sea breeze, such as “Iba-fornia Beach Camping Place.” We recommend combining swimming with outdoor activities.
A symbol of Hiraiso Beach, loved year-round
Whether swimming energetically in the ocean during the summer or quietly waiting for summer on the sandy beach during the off-season, both scenes showcase the charm of “Daichan the Whale.” Why not create a special memory at the Hiraiso beach—a place cherished by locals and offering a different vibe from flashy resort destinations?
Location Data: Hitachinaka City, IbarakiHiraiso Town
Access: From “Katsuta Station” on the JR Joban Line, transfer to the Minato Line and get off at “Hiraiso Station.”
By car, it’s about 10 minutes from the “Hitachinaka IC” on the Joban Expressway and North Kanto Expressway.