A window regulator includes a carrier. The carrier includes a holding section and is capable slide along a guide rail with the holding section slidably contacting on the guide rail. The carrier supports a window panel. A brake mechanism is provided on the carrier. The brake mechanism prevents the window panel (the carrier) from self-weight drop by slidably contacting onto the guide rail by an urging force thereof. According to the window regulator, good down operations of the window panel can be maintained even if a slidably contacting portion(s) of the holding section that holds the guide rail becomes worn.