To provide a new erogenous zone stimulator capable of developing and training an erogenous zone inside a rectum by stimulating the rectum and promoting the contraction movement of the rectum.

The erogenous zone stimulator consists of an insertion part with such a shape and size as to be inserted into the rectum and a projection part projecting from the root of the insertion part toward the perineal section. In addition, a vibrator is mounted inside the insertion part.