A flush toilet includes a toilet main body and a tank device that supplies flush water to the toilet main body, where the tank device includes a storage tank provided behind the toilet main body and above a floor surface, and a water supply device that supplies the flush water to the storage tank, a capacity of an upper part located at a position higher than a middle height position that equally divides the storage tank into two in an up-down direction is greater than a capacity of a lower part located at a position lower than the middle height position, and the storage tank includes a plurality of upper surfaces with height differences, and a water passage port is provided in a manner penetrating a highest surface among the upper surfaces to allow the flush water supplied from the water supply device to flow into the storage tank.