PURPOSE: To prevent two arms from interfering with each other, concurrently prevent a plurality of robots from interfering with one another, and thereby enable twin arm robots to be used in various systems in a simple manner without interfering with one another by letting the condition of each arm for each twin arm robot be outputted at all times.

CONSTITUTION: The turnable fulcrums O1 and O2 of first arms 10 and 10, which act as the rotating fulcrums of a right and left arm 6a and 6b are parted by the same distances L and L to the right and left sides of a column 5, and the operating ranges of both the arms 6a and 6b are partially overlapped, so that they have a so-called interfering range. A motor 9a for the feed screw stems 9 of the arms 6a and 6b and a motor for joint sections are so devised as to be automatically controlled by a controller 13 in such a way that both the arms 6a and 6b are freely operated without interfering with each other. Moreover, their actions are so devised as to be taught by a teaching means 14 provided for the controller 13.