Abstract: A back scrubber has a base and a cleaning plate. The base has a front basal surface, a rear basal surface and a slot. The slot is formed in the front basal surface and has a slot opening, an inner wall and an engaging structure. The cleaning plate has a front plate surface, a rear plate surface, an inserting member and an engaging member. The front plate surface is uneven. The inserting member protrudes into the slot. The engaging member is formed on the inserting member and engaged with the engaging structure. The back scrubber in accordance with the present invention can be used to effectively and efficiently wash and is capable of saving body-cleansing agent and water.