A flush toilet (1) is provided comprising a storage tank (4), a toilet body (2) including a discharge trap (16), and an overflow channel (34) causing flush water to overflow when the flush water within the storage tank (4) exceeds a predetermined water level (WL3), the overflow channel (34) is provided to connect the storage tank (4) and a discharge flow channel (22) downstream of a bent conduit (16a) of the discharge trap (16) containing sealed water formed inside, and the storage tank (4) includes a reservoir provided in a part of the storage tank to constantly reserve flush water regardless of toilet flushing, and a connecting flow channel (4g) provided upstream of the overflow channel (34) to connect the reservoir (4) and the overflow channel (34).