Electric actuator

An electric actuator (21) includes: a housing (22) that accommodates a shift select shaft; an electric motor (23) that generates rotational driving force; a select conversion mechanism (25) and a shift conversion mechanism (24) that transmit the rotational driving force to the shift select shaft (15); a select electromagnetic clutch (56) that allows or interrupts transmission of the rotational driving force to the select conversion mechanism; a shift electromagnetic clutch (43) that allows or interrupts transmission of the rotational driving force to the shift conversion mechanism; and a clutch casing that is accommodated in the housing and that accommodates the select electromagnetic clutch and the shift electromagnetic clutch. A seal member (151) (O-rings and sealed bearings) for shutting off an inside and an outside of the clutch casing (140) from each other is provided in the housing.