PURPOSE: To make any collision automatically preventable with a simple structure by installing a flux generating means in a body, while installing a superconductive member, eliminating any magnetic flux being generated by this flux generating means, in the other body.

CONSTITUTION: A flux generating means such as a magnet 14 or the like is set up in one side manipulator 1a in two manipulators 1a, 1b, for example, on each surface of links 5a, 8a, a joint 10a and a hand 12a. As the flux generating means, there are various elements such as an electromagnet, a permanent magnet, a coil or the like. Then, each superconductive member 16 is set up on each surface of links 5b, 8b, a joint 10b and a hand 12b of the other side manipulator 1b.