Patent ID: 8733098

Claim:
A shape memory alloy actuator comprising: a shape memory alloy wire portion of which a length changes due to contraction by heating by applying current, and due to elongation by cooling; a non-deformable portion which is formed at an other end of the shape memory alloy wire portion, and of which a length does not change; a wire portion which is formed by the shape memory alloy wire portion and the non-deformable portion; a tube member in which the wire portion is inserted into; a movable body which is movable in a direction in which the length of the shape memory alloy wire portion changes; an elastic member which exerts an external force in the direction in which the shape memory alloy wire portion elongates; and a fixed member to which one end of the tube member and one end of the shape memory alloy wire portion are fixed, wherein one end of the non-deformable portion which forms the wire portion is connected to the movable body, and the tube member includes therein the shape memory alloy wire portion, and includes therein at least a part of the non-deformable portion.