PURPOSE: To prevent nonuniform treatment and defective treatment in cleaning and plating.

CONSTITUTION: This treating device 1 is provided with a lifting means 9 for moving a treating basket 14 contg. a material to be cleaned or plated up and down in a processing soln. L. In this case, the descending speed by the lifting means is made ≥2 times higher than the ascending speed. Consequently, the material is sufficiently agitated and uniformly treated. In the case of a cleaner using an ultrasonic vibrator 7, plural movements with the descending speed being the same as the ascending speed are combined with at least one vertical movement with the descending speed being ≥2 times higher than the ascending speed, hence the defective application of ultrasonic vibration due to the violent fluctuations of the liq. level is not caused, and uniform cleaning is performed.