To provide a remote-controlled actuator surely changing by remote control operation the attitude of a tool mounted to the distal end of an elongated pipe section.

This remote-controlled actuator includes: an elongated-shaped spindle guide section 3, a distal end member 2 mounted to its distal end through a distal-end-member connecting section 15 such that its attitude is changeable; a tool 1 rotatably mounted to the distal end member 2; a driving source for tool rotation, rotating the tool 1; and a driving source for attitude change, operating the attitude of the distal end member 2. The distal end member 2 rotatably supports a spindle 13 for holding the tool 1. The spindle guide section 3 has, in its inside, a rotating shaft 22 for transmitting rotation of the driving source for tool rotation to the spindle 13 and also a guide hole 30a penetrating through to both the ends. An attitude operating wire 31a which changes the attitude of the distal end member 2 by moving forward and backward is inserted through the guide hole 30a so as to move forward and backward. The attitude operating wire 31a is moved forward and backward by the driving source for attitude change.