Vehicle driving force transmitting device

It prevents ausleckendes oil leaked from a hydraulic actuator, which operates a dry clutch in a drying room in which the dry clutch is placed. A space 57 which is formed by the rear surface of a piston of a hydraulic actuator 50, a coupling plate 56, and a cylinder portion 51, by a first sealing area 55 and a second sealing area sealed 59th Oil which has leaked from a hydraulic oil chamber 50a through the piston 52 is stored in the space 57 and returned to a wet space W in a casing 25a through an oil passage 61st