To provide a bathtub cleaning device that reduces household chores because it performs automatedly and causes no ill effect upon the environment because it does not use chemicals.

A floating member 41 allows the cleaning device to stay on the water, and a crawler 21 which is a locomotion means and a rotating brush 11 are pressed against the tub inner wall by the thrust generated by a propeller 31. A cleaning device constructed as such cap float on the water surface and travel on the tub inner wall for automatedly cleaning the wall surface.