PURPOSE: To easily carry out the deformation of a material by giving heat which is detected and transferred by a heat pipe, to a fluid in a container, and further giving said heat from the fluid to a shape memory material.

CONSTITUTION: A heat pipe 7 passes through a container 1 and a solid body 8 and is fixed, while a heat pipe 9 on which fins 10 are installed, passes through the container 1 and is fixed. Shape memory treatment is given to shape memory alloys 2, 3 to that the length of coils become (a) at a temperature T2. The heat pipes detect the heat of the fluid and the solid body to make rods recipro cate at a stroke of difference between the lengths (a) and (b), driving an equip ment. Accordingly, the degree of freedom of installation including the configura tion of a part for deformation, can be increased.