In a driving apparatus having a casing 10A in which an electric motor 16 is housed, the driving apparatus further has: a rotating shaft 27 through which a torque of the electric motor 16 is transmitted, the rotating shaft 27 being formed with a worm 40; a worm wheel 41 which is disposed in the casing 10A, the worm wheel 41 having a worm gear 42 which is engaged with the worm 40; a terminal holder 31 which is disposed in the casing 10A, and which supports a terminal carrying a current to be supplied to the electric motor 16; and an air hole 78 which extends so as to penetrate the casing 10A, an inside of the casing 10A and an outside of the casing 10A communicating with each other through the air hole 78, wherein in a plan view perpendicular to an axis C1 serving as a rotation center of the worm wheel 41, the air hole 78 is disposed in an area defined by projection of an area occupied by the terminal holder 31 in a direction along an axis B1, and between the electric motor and an engaging part E1 of the worm 40 with the worm gear 42.