A retractable roof fixing apparatus capable of drawing the roof to a vehicle body to be snugly fixed thereto by automatically retracting a striker engaged with a latch by a sufficient distance. The retractable roof fixing apparatus comprises: a striker fixed on a roof; a base plate fixed on a body of a vehicle; a slide plate slidably attached to the base plate in a direction of movement of the striker; a latch rotatably mounted on the slide plate that engages the striker with a rotation of the latch; a cam rotatably mounted on the base plate; and a motor that rotates the cam, wherein the motor operates when the striker engages the latch to rotate the cam so as to slide the slide plate away from the roof.