Toto Ltd.

Koji Shibuya

Shu Kashirajima

Yuuki Shinohara

Yusuke Tone

Provided is a tank device capable of restraining splashing of flush water during water supply to suppress a water slapping sound. A tank device for supplying flush water stored therein to a flush toilet comprises: a tank main unit for storing flush water in an internal spaceC thereof defined by an inner wall surface which comprises a transverse surfaceB extending in a transverse direction and a standing surfaceA extending in an up-down direction; and a water supply memberfor supplying flush water from a water supply portA to the internal space of the tank main unit, the water supply memberbeing configured to spout flush water toward the inner wall surface defining the internal spaceC, wherein the tank main unit comprises a flow rectifying portionprovided in a region of the inner wall surface to which flush water is spouted, the flow rectifying portionhaving a convex partA and a concave partB each formed on the inner wall surface.

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Kitakyushu, Japan

Koji Shibuya