A flush toilet in which an appropriate amount of water is supplied and that can be installed in an area where water pressure is low. The flush toilet is flushed with pressurized flush water and has a flush toilet body having a bowl and a drain trap pipe path; a pressurizing pump for pressurizing flush water to be jetted out; a water storage tank for storing flush water to be pressurized; flush control means for causing rim water discharge to be performed for a predetermined rim water discharge time by water supply pressure of running water and also causing jet water discharge to be made to flush the bowl; flush water replenishing means for replenishing, after the bowl is flushed, flush water to the water storage tank from the running water to thereby return the amount of flush water stored in the water storage tank to a specified level; timing means for measuring a water replenishing time after the flush water replenishing is started until the amount of flush water stored in the water storage tank return to the specified level; and water discharge time regulation means for regulating the rim water discharge time based on the water replenishing time.