Yamasa Soy Sauce Factory

Little knownBarely documented in English. This is the kind of place the site exists for.

Recherche et rédaction Hinato

soy saucefactory tourfermentationChoshi specialtyhistoric

Préfecture de Chiba · Choshi

35.7350°N, 140.8275°E

Yamasa Corporation, founded in 1645, is one of Japan's oldest soy sauce breweries and the largest in Choshi — a city that produces 20% of Japan's soy sauce due to abundant quality water and proximity to soybean shipping routes. The Yamasa factory compound covers 12 hectares and includes Edo-period fermentation warehouses built from cedar and clay, now designated cultural properties.

The factory offers free guided tours (Japanese only, but English pamphlets provided) through the brewing process: soybeans are steamed, mixed with roasted wheat and koji mold, then fermented in massive cedar barrels for 6-8 months. The scent inside the fermentation warehouse — deep, salty, slightly sweet — is overwhelming and unforgettable. The tour ends with tastings of multiple soy sauce grades, from light usukuchi to rich tamari.

Informations essentielles

Horaires d'ouverture

Tours: Mon–Fri at 9:00 AM, 10:30 AM, 1:00 PM, 2:30 PM | Factory shop: 9:00 AM – 5:00 PM daily

Fermé: Tours: Closed weekends | Factory shop: Open daily

Tarif d'entrée

Free (tour and shop)

Meilleure saison

Year-round (indoor factory and shop) | Reservations recommended for tours

Durée de visite

1.5-2 hours (tour + tasting + shop)

Comment s'y rendre

Informations d'accès

Yamasa Soy Sauce Factory: 2570 Kitakogawa-cho, Choshi City. By bus from Choshi Station. Tours: Mon-Fri 9:00, 10:30, 13:00, 14:30 (closed weekends, reservations recommended). Free entry.

Guide d'initié

**Barrel-aged premium soy sauce:** The factory shop sells limited-edition soy sauce aged in 100-year-old cedar barrels (kioke) for 3+ years — unavailable in regular stores. The 720ml bottle (¥1,800) is noticeably more complex than standard soy sauce, with caramel and umami depth. Perfect for sashimi and sushi dipping. **Tasting comparison:** The tasting area offers side-by-side comparison of koikuchi (dark soy sauce, 80% of Japanese production), usukuchi (light, saltier), tamari (thicker, wheat-free), and shiro (white soy sauce, almost clear). The differences in aroma, viscosity, and salinity are revelatory. **Historical warehouse:** The Edo-period warehouse retains original clay walls and wooden beams darkened by 300+ years of soy sauce fermentation. The walls host koji bacteria colonies passed down through generations — the building itself is part of the flavor profile. **Combine with Choshi Fish Market:** Choshi Port (by car) is Japan's top fish landing port by volume. The morning market (6:00–9:00) sells sashimi-grade tuna, sardines, and mackerel direct from boats. Buy sashimi + fresh wasabi + Yamasa soy sauce for a DIY premium experience.

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