PURPOSE: To suck and deliver fluid at high efficiency by connecting a vibratory mechanism consisting of an ultra magnetostrictive member to the outer periphery of a fluid chamber made of elastic members and vibrating it with alternating current applied to the ultra magnetostrictive member to alter the internal volume of the fluid chamber.

CONSTITUTION: A suction pipe 2 and a delivery pipe 3 to which check valves 4 and 5 are provided respectively, are connected to both ends of a fluid chamber 1 made of elastic members such as stainless steel, etc. of proper thickness. The fluid chamber 1 is so constructed that it can be restored by its elastic force when its volume is reduced. A connecting seat 11 comes in contact with the fluid chamber 1, placed on a fixed wall 10, at its outer surface opposite to the fixed wall 10, and a magnetostrictive column 12 is sandwiched between the other surface of the connecting seat 11 and another fixed wall 10. A driving coil 13 is provided on the outer periphery of the magnetostrictive column 12 to give the column telescopic motion by applying alternating field thereto. The magnetostrictive column 12 is extended and retracted by alternating field to increase and decrease the internal volume of the fluid chamber 1, repeatedly, and the fluid in the fluid chamber 1 is sucked and delivered. Thus, any sliding portion can be eliminated and, as a result, friction is not produced to operate a pump at high efficiency.