A flush toilet forms a bowl including a waste-receiving surface and a rim; a rim water passageway and rim spout port for spouting flush water into the bowl and forming a circulating flow are formed on the rim; this rim spout port downstream side flow path changes in curvature from small to large at curved portions formed at positions in the rim inner circumferential wall closest to the rim spout port in at least the right rear area inside the bowl and the front area inside the bowl, and these curved portions are formed by transition curves as seen in plan view.