A sunroof apparatus includes: a movable panel adapted to open and close an opening formed in a roof of a vehicle; a guide rail provided in each edge portion of the opening in a lateral direction, and including upper and lower flanges extending in the lateral direction and a connecting wall through which the respective outside ends of the upper and lower flanges in the lateral direction are connected to each other in the vertical direction; and a shielding body attached to each edge portion of the movable panel in the lateral direction, and including an extending piece that extends to the outside in the lateral direction while being interposed between the upper and lower flanges, wherein the shielding body includes first and second projections which are provided in the extending piece and can be respectively brought into contact with the upper and lower flanges.