An interdental brush of the present invention includes bristles (11), a wire (12) twisted with the bristles (11), and a handle (20) attached to the wire (12). The handle (20) includes a main body (21). The main body (21) is formed with a longitudinal hole (41) through which a base part of the wire (12) extends, a space section (42) connecting to the longitudinal hole (41), and extending through the main body (21) in a lateral direction, and a tubular wire detachment preventing portion (50) extending from a peripheral portion of an opening of the longitudinal hole (41) at an inner wall surface of the space section (42) into the space section (42). The wire detachment preventing portion (50) is curved together with the wire (12) with a tip portion of the base part of the wire (12) being inserted therein.
