A window regulator includes a guide rail provided along an ascending/descending direction of a window of a vehicle, a carrier plate that slides on the guide rail and moves together with the window, cables that pulls the carrier plate, a drum that is rotationally driven by a motor, and a housing that includes a drum housing accommodating the drum and a motor housing fixed to the drum housing and accommodating a portion of the motor. The drum housing includes a fitting portion including a fitting hole to insert a lower end of the guide rail and a fastening hole used to fasten the motor housing. The fastening hole of the drum housing is provided at a position overlapping the guide rail in a longitudinal direction of the vehicle.