Yachiyo-za, Theater in Yamaga, Japan.

Yachiyo-za is a two-story wooden playhouse with a frontage of 17.2 m and a depth of 25.8 m, built in 1910. Its stage has a proscenium opening 13.38 m wide and 10.50 m deep, with a revolving stage 8.45 m in diameter and a capacity of about 650. The auditorium retains a hanamichi, masu seating, and a grape trellis above the stage.

Entrepreneurs in Yamaga founded the theater in 1910, and it went through cycles of prosperity and decline over the decades. In 1988 it received Important Cultural Property status, securing its preservation as a nationally significant site.

The stage's revolving platform runs on rails stamped "KRUPP1910", made by the German Krupp works, while cast-iron columns support the upper seating. Above the stage hangs a grape trellis for suspending props, and the ceiling carries painted advertisements. Kabuki, silent films, recitals and school plays have all been staged here.

Yachiyo-za stands at 1499 Yamaga, Yamaga City, Kumamoto. From Kumamoto Sakuramachi Bus Terminal, Tamana Station or Shin-Tamana Station take a Kyushu Sanko bus bound for Yamaga Onsen and get off at Yamaga Onsen (Yachiyo-za entrance), about 4 minutes' walk (330 m) away. By car it is 12 km from the Ueki IC and 9.5 km from the Kikuchi IC on the Kyushu Expressway.

The revolving stage runs on rails stamped "KRUPP1910", made by the German Krupp works, and the two-tier seating is carried on cast-iron columns. The designer, Kimura Kametarō, was a shipping merchant and lantern maker also credited with the ceiling advertisements' sketches; he is sometimes called Yamaga's Leonardo da Vinci.