To eliminate a problem capable of scarcely erasing a character or the like written on a white board surface using a dry surface material such as a felt or the like as a conventional white board eraser and writing no character or the like immediately after erasing on the board using a wet surface material such as a wet dustcloth or the like.

The white board eraser comprises a wiper 1 having a wiping surface 1a, a case 2 having a blade 2a disposed near the side face of the wiper 1 and including the wiper, and a liquid supplying unit 3 including a sponge 3a for supplying a liquid to the surface and having a size larger by one size than the case.