To provide a stimulator for oral sex that gives an innovative way for oral sex.

A stimulator for oral sex includes a body 15 and a motor. The body has a clipping structure which can be clipped onto and worn on a mouth such that a fore part 13 of the body is contacted with a wall of mouth cavity when the rear part 16 of the body contacts an outer surface of a face. The stimulator facilitates the user to clip, wear and take off the stimulator and a micro-circuit control chip controls an output of the motor for different modes of vibration. In addition, the overall small size only occupies a little space within the mouth cavity without affecting the motions in the course of oral sex.