A window regulator prevents a carrier plate from derailing from a guide rail by preventing the generation of a force which is applied when the carrier plate and a stopper member collide with each other and which lifts up the carrier plate. In the window regulator, an impact absorption body is installed in a press fitting recess of the carrier plate. The impact absorption body is made of an elastic material for absorbing an impact caused by a collision between the carrier plate and the stopper member that regulates a slide position of the carrier plate. A collision surface formed on the stopper member is tilted toward the carrier plate with respect to a plane that is perpendicular to an axis of the guide rail such that the collision surface pushes the carrier plate down toward the guide rail when it collides with the impact absorbing body.