A power slide window for opening and closing an opening provided in a window glass pane with a slide panel, the power slide window comprising: a guide rail provided on the window glass pane along a panel surface of the window glass pane; at least one pin projecting from the slide panel along the panel surface in a direction crossing a longitudinal direction of the guide rail; a pin guide groove formed in the guide rail to receive the at least one pin, the pin guide groove including a groove main portion extending along the panel surface in the opening and closing direction and at least one groove extension portion extending from the groove main portion to drive the slide panel in a direction to approach the window glass pane via the at least one pin when the slide panel reaches a vicinity of a closed position; a slider slidably provided in a slider guide groove formed in the guide rail and slidingly driven by a drive source in the opening and closing direction; at least one pin drive groove that is formed in the slider to engage the at least one pin and extends in a direction crossing the panel surface and inclined to a direction of extension of the groove main portion; and a stopper provided in the slider guide groove to limit a movement of the slider toward the closed position, characterized in that the power slide window further comprises: a position adjustment structure capable of adjusting a position of the stopper in a direction of extension of the slider guide groove, wherein the position adjustment structure includes at least one engagement recess formed on a side surface of one of the slider guide groove and the stopper at a prescribed interval in the longitudinal direction of the guide rail and at least one engagement protrusion formed on a side surface of the other of the slider guide groove and the stopper to engage the engagement recess, and is configured to be capable of attaching the stopper to the guide rail at multiple different positions in the direction of extension of the slider guide groove by engagement between the engagement recess and the engagement protrusion. a guide rail provided on the window glass pane along a panel surface of the window glass pane; at least one pin projecting from the slide panel along the panel surface in a direction crossing a longitudinal direction of the guide rail; a pin guide groove formed in the guide rail to receive the at least one pin, the pin guide groove including a groove main portion extending along the panel surface in the opening and closing direction and at least one groove extension portion extending from the groove main portion to drive the slide panel in a direction to approach the window glass pane via the at least one pin when the slide panel reaches a vicinity of a closed position; a slider slidably provided in a slider guide groove formed in the guide rail and slidingly driven by a drive source in the opening and closing direction; at least one pin drive groove that is formed in the slider to engage the at least one pin and extends in a direction crossing the panel surface and inclined to a direction of extension of the groove main portion; and a stopper provided in the slider guide groove to limit a movement of the slider toward the closed position, characterized in that the power slide window further comprises: a position adjustment structure capable of adjusting a position of the stopper in a direction of extension of the slider guide groove, wherein the position adjustment structure includes at least one engagement recess formed on a side surface of one of the slider guide groove and the stopper at a prescribed interval in the longitudinal direction of the guide rail and at least one engagement protrusion formed on a side surface of the other of the slider guide groove and the stopper to engage the engagement recess, and is configured to be capable of attaching the stopper to the guide rail at multiple different positions in the direction of extension of the slider guide groove by engagement between the engagement recess and the engagement protrusion. a position adjustment structure capable of adjusting a position of the stopper in a direction of extension of the slider guide groove, wherein the position adjustment structure includes at least one engagement recess formed on a side surface of one of the slider guide groove and the stopper at a prescribed interval in the longitudinal direction of the guide rail and at least one engagement protrusion formed on a side surface of the other of the slider guide groove and the stopper to engage the engagement recess, and is configured to be capable of attaching the stopper to the guide rail at multiple different positions in the direction of extension of the slider guide groove by engagement between the engagement recess and the engagement protrusion.