A window regulator (1) comprises a drive gear that is attached to a drive motor (4), a pliable push-pull member (6) with an open end that engages with the drive gear and is push-pulled by the two-way rotation of the drive gear, and a carrier (7) that connects to one end side of the push-pull member (6) and connects to a window pane, wherein a drive route (R1) of the push-pull member (6) from an engaging portion between the drive gear and the push-pull member (6) to an attaching portion of the carrier (7) is formed in a linear shape, and at least one portion of an idling route (R2) from the engaging portion to an other end of the member is formed in a curved shape, viewed from a direction (Q) that is substantially parallel with the pane surface of the window glass.