A sunroof apparatus including a front panel closing a front portion of a roof opening of a vehicle and a rear panel closing a rear portion of said roof opening, the sunroof apparatus comprising: a guide rail below the front panel and the rear panel; a front slider supported movably back and forth by the guide rail between the front panel and the guide rail so as to be moved back and forth to thereby move the front panel up and down and move the front panel back and forth, and a rear slider supported movably back and forth by the guide rail between the guide rail and the rear panel so as to be moved back and forth to thereby move the rear panel up and down and move the rear panel back and forth, characterized in that a front timing member locked by the front locking member provided in the side of the guide rail during the up-and-down movement of the front panel so as to regulate the back-and-forth movement of the front panel and the front timing member being disengaged from the front locking member during the back-and-forth movement of the front panel so as to be moved back and forth together with the front slider; and a rear timing member locked by the rear locking member provided in the side of the guide rail during the up-and-down movement of the rear panel so as to regulate the back-and-forth movement of the rear panel and the rear timing member being disengaged from the rear locking member during the back-and-forth movement of the rear panel so as to be moved back and forth together with the rear slider, wherein said front timing member is located in the front side of the front panel and the rear timing member is located in the rear end side of the rear panel so that the front and rear timing members (45, 84) are moved back and forth within the same timing guide groove formed in the guide rail. a guide rail below the front panel and the rear panel; a front slider supported movably back and forth by the guide rail between the front panel and the guide rail so as to be moved back and forth to thereby move the front panel up and down and move the front panel back and forth, and a rear slider supported movably back and forth by the guide rail between the guide rail and the rear panel so as to be moved back and forth to thereby move the rear panel up and down and move the rear panel back and forth, characterized in that a front timing member locked by the front locking member provided in the side of the guide rail during the up-and-down movement of the front panel so as to regulate the back-and-forth movement of the front panel and the front timing member being disengaged from the front locking member during the back-and-forth movement of the front panel so as to be moved back and forth together with the front slider; and a rear timing member locked by the rear locking member provided in the side of the guide rail during the up-and-down movement of the rear panel so as to regulate the back-and-forth movement of the rear panel and the rear timing member being disengaged from the rear locking member during the back-and-forth movement of the rear panel so as to be moved back and forth together with the rear slider, wherein said front timing member is located in the front side of the front panel and the rear timing member is located in the rear end side of the rear panel so that the front and rear timing members (45, 84) are moved back and forth within the same timing guide groove formed in the guide rail.