A curved guide mechanism includes a guide unit having an arcuate guide track, and a movable body movably engaged with the guide track via a plurality of engagement elements. The guide track is constituted by a guide groove formed in the guide unit. The movable body is provided with at least three engagement elements including inner engagement elements movably engaged with an inner peripheral rail portion formed on the inner peripheral side of the guide groove, and an outer engagement element movably engaged with an outer peripheral rail portion formed on the outer peripheral side of the guide groove. The engagement elements are spaced apart from one another in a longitudinal direction of the guide groove.