To provide a power slide window in which the projecting dimension of the guide rail from the panel surface is small, the guide rail (4) defines a pin guide groove (26) that includes a groove main portion (26a) extending along a panel surface (2b) and at least one groove extension portion (26b) configured to drive a slide panel (3) in a direction to approach the window glass pane (2) via a pin (16) when the slide panel reaches the vicinity of the closed position. A slider guide groove (27) provided in the guide rail 4 to allow sliding of the slider 20 which is slidingly driven in the opening and closing direction and a groove main portion (26a) of a pin guide groove (26) are formed at least partially in common with each other.