To provide a portable crime prevention buzzer structured to easily secure the safety of the body of a carrier for easily specifying the assailant of any criminal act, and for making it easy for a victim to escape from the assailant due to the interruption of the criminal act.

This portable crime prevention buzzer is equipped with a buzzer driving means for issuing a warning sound when a buzzer driving circuit is closed inside the crime prevention buzzer main body and a mounting means for mounting the crime prevention buzzer main body on the external face of the crime prevention buzzer main body.