PURPOSE: To prevent interference of an obstacle with an arm, etc., in a small space by supporting specified number of bar fingers arranged so that they can be moved in parallel with each other on a finger support through a drive mechanism.

CONSTITUTION: When servo motors 26, 27, and 28 are driven reversibly, rack gears 20, 21, and 22 are driven vertically through pinions 23, 24, and 25 and, accordingly, three fingers 8, 9, and 10 are also moved vertically in parallel with each other. The amount of movement of these fingers can be controlled variably by controllably setting the speed of the servo motors at any value. By this, an objective part can be held securely by three bar fingers and, by its control, the servo motor corresponding to each finger is rotated by a required amount to, for example, rotate the objective part around the finger 10. Or the fingers are moved in the same direction by the same distance to move the objective part itself and control its attitude.