To provide a sunroof apparatus including a front panel and a rear panel closing a roof opening formed in a roof of a vehicle, capable of keeping a large distance in a back-and-forth direction between the supporting portions supporting the front and rear portions of the rear panel in a fully closed state of closing the roof opening by the front panel and the rear panel.In a fully closed state of panels, a rear forward supporting portion supporting the front portion of the rear panel is provided in a rear portion of a front slider and a rear backward supporting portion supporting the rear portion of the rear panel is provided in a rear slider.