To provide an apparatus for removing dirt on a box capable of satisfactorily removing dirt in a short period of time, and to provide a box washing system with the apparatus.

A transfer robot 22 which grips a housing box 10 in such a way that the dirty face of the box 10 is exposed to a shot blasting device 20 and a shot blast 23 which jets zinc shots toward the box 10 gripped by the robot 22 to remove the dirt on the box 10 are disposed. The robot 22 grips the box 10 in such a way that the opening of the box 10 faces downward from the horizontal direction. The robot 22 grips the box 10 in such a way that the attitude of the box 10 to the jet orifice of the shot blast 23 can be varied. Movement of the robot 22 and opening and shutting of a shutter 28a, etc., are interlocked. The shot blasting device 20 is incorporated into a box washing system S with an alkali washing device 30, etc.