Abstract: A toilet bowl portion, a rim portion that forms a peripheral portion of an upper end opening of the toilet bowl portion, a first rim water discharge port formed on an inner circumferential wall portion of the rim portion, and a first rim water passage that is formed on the outer circumferential side of the toilet bowl portion and is for supplying washing water to the first rim water discharge port are provided, and the first rim water passage has a turned-back portion that guides washing water to turn back from one side to the other side in the circumferential direction of the toilet bowl portion, a portion of an outbound portion and a portion of an inbound portion that continue to the turned-back portion being arranged while being lined up in the vertical direction.