To provide a rotary toothbrush, facilitating vertical brushing for the teeth, and easily clearing stains on the teeth and residual piece of food between the teeth.

In cleaning the outer surfaces of user's teeth, when a slide in hand of a gripping hand is reciprocated in the lateral direction by his thumb, an intermediate shaft is associated and rotated so that the brush cleans his teeth vertically. Further, in cleaning the inner surfaces thereof, his forefinger or middle finger are moved to clean his teeth.