The invention provides a window regulator capable of realizing small size and light weight. The window regulator (1) includes a guide rail (20) arranged along the traveling direction of a windowpane (90); a metal wire (3) tensely fitted along the longitudinal direction of the guide rail (20); and a traveling body (4) that is guided along the guide rail (20) and travels together with the windowpane (90). The traveling body (4) includes a drum (40); a motor (5) that rotationally drives the drum (40); and a housing (6) holding the drum (40) and the motor (5) and consisting of a drum housing (61) and a gear housing (62). The drum housing (61) includes a first region (610a) and a second region (610b) divided in the front-rear direction of a vehicle. The gear housing (62) has a first fixing portion (621) fixed to the first region (610a) and a second fixing portion (622) fixed to the second region (610b).