To provide a lid for a drain hole in a bathroom preventing hot or cold water from collecting on its surface.

The lid for a drain hole in a bathroom is adapted to cover a drain hole provided in a portion of a washing space floor, with the peripheral edge of the lid received by a receiving part provided along the peripheral edge of the drain hole and taking the form of a step lower than the washing space floor face. The upper surface of the lid is formed by joining together a plurality of slopes which slope downwardly from the highest point of the upper surface toward their respective end edges facing the end edges of the washing floor space.