In a window regulator which moves a slider base, slidable along a guide rail, via a pair of wires, the slider base is configured of: a body member made of synthetic resin which is slidably supported by the guide rail and to which each wire is connected; and a support member made of metal which supports a window glass, and the support member is provided with a holding portion which holds the body member in the widthwise direction of the guide rail. This configuration makes it possible to achieve a window regulator in which the slider base is not easily warped or deformed when an external force is exerted thereon and which is superior in strength and durability.