A sunroof apparatus includes: a movable panel adapted to open and close an opening in a roof of a vehicle; a guide rail provided at each of both-side edge portions of the opening; a cable which has a driving-side engagement portion and is driven to move in a forward and backward direction of the vehicle; a slide member having a driven-side engagement portion engaging with the driving-side engagement portion, linked to each of both-side edge portions, and provided to be movable in the forward and backward direction, along the guide rail, so that movement of the slide member causes the movable panel to open and close; and a holding portion protruding from the slide member in the width direction of the vehicle and positioned backward of the cable to abut against or close to the cable.