A roof apparatus includes: a movable panel opening and closing an opening of a roof of a vehicle; a mounting member including a mounting wall extending upright in one direction along an edge portion of the opening; and a weather strip having an attaching portion including pinching strips pinching the mounting wall therebetween, a first seal portion connected to the attaching portion and coming into liquid-tight contact with an opening end edge, and a second seal portion connected to the attaching portion and coming into liquid-tight contact with a peripheral edge in a fully closed state. A mounting depression depressed in the inner and outer direction of the vehicle is formed on the mounting wall. The attaching portion includes a lip portion connected to one of the pinching strips facing the mounting depression, and engageably inserted into the mounting depression.