A cover structure of an actuator is provided in which a case of the actuator, which houses a conversion mechanism that converts input energy to mechanical motion, has a metal cover fastening portion and a cover member to which a metal fastening part that is fastened to the cover fastening portion is integrally attached. The cover member is formed by a metal cover portion and a resin cover portion. The metal cover portion has a center portion that covers part of the conversion mechanism, and an extended portion that extends from the center portion to the area near the metal fastening part so as to oppose the cover fastening portion. In this way, a vehicular power transmitting apparatus that discourages theft is provided by realizing an actuator with a strong cover fastening structure by making the fastening portion of the actuator be able to withstand intentionally inflicted damage without its weight being increased much.