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 to define a pin guide groove that extends along a panel surface of the window glass pane in an opening and closing direction; at least one pin projecting from the slide panel along the panel surface in a direction crossing the opening and closing direction to engage the pin guide groove; a slider slidably provided in a slider guide groove provided in the guide rail and configured to be slidingly driven by a drive source in the opening and closing direction; and at least one pin drive groove formed in the slider to receive the at least one pin, the at least one pin drive groove extending in a direction crossing the panel surface, wherein the pin guide groove includes a groove main portion extending along the panel surface 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, the groove main portion of the pin guide groove and the slider guide groove are formed to have same widths as each other in the direction crossing the panel surface and arranged at positions overlapping with each other in the opening and closing direction so as to be made at least partially in common with each other in the opening and closing direction, wherein the at least one groove extension portion is connected to an end portion of the groove main portion on a side of the closed position, the slider guide groove includes a slider-dedicated groove portion that extends in a direction of extension of the groove main portion beyond the end portion of the groove main portion on the side of the closed position, characterized in that the slider-dedicated groove portion is formed to be shallower than the groove main portion and the at least one groove extension portion, and the at least one pin has a projection length larger than a depth of the slider-dedicated groove portion. a guide rail provided on the window glass pane to define a pin guide groove that extends along a panel surface of the window glass pane in an opening and closing direction; at least one pin projecting from the slide panel along the panel surface in a direction crossing the opening and closing direction to engage the pin guide groove; a slider slidably provided in a slider guide groove provided in the guide rail and configured to be slidingly driven by a drive source in the opening and closing direction; and at least one pin drive groove formed in the slider to receive the at least one pin, the at least one pin drive groove extending in a direction crossing the panel surface, wherein the pin guide groove includes a groove main portion extending along the panel surface 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, the groove main portion of the pin guide groove and the slider guide groove are formed to have same widths as each other in the direction crossing the panel surface and arranged at positions overlapping with each other in the opening and closing direction so as to be made at least partially in common with each other in the opening and closing direction, the at least one groove extension portion is connected to an end portion of the groove main portion on a side of the closed position, the slider guide groove includes a slider-dedicated groove portion that extends in a direction of extension of the groove main portion beyond the end portion of the groove main portion on the side of the closed position, the slider-dedicated groove portion is formed to be shallower than the groove main portion and the at least one groove extension portion, and the at least one pin has a projection length larger than a depth of the slider-dedicated groove portion.