A remote controlled actuator includes an elongated guide section (3) of a curved shape, a distal end member (2) fitted to a tip of the guide section for alteration in attitude, and a work tool (1) provided in the distal end member. A drive shaft (22) for transmitting a driving force of a work tool drive source (41) to the work tool and a curved guide hole (30a) extending to its opposite ends are accommodated inside the guide section. A wire-like attitude altering member (31) is inserted within the guide hole for selective advance or retraction and then is driven by an attitude altering drive source (42) to alter the attitude of the distal end member. The attitude altering member has a curved shape identical with the curved shape of the guide hole under a natural condition while it has not yet been inserted into the guide hole.