PURPOSE: To easily add an arm to be driven by a driving means on request of a user by previously attaching a control means for controlling a driving means on a control part.

CONSTITUTION: Since a control means for previously controlling a pulse motor 15b is previously attached on a control part 19 in a scalar-type robot, an arm 15 to be driven by the pulse motor 15b is easily added on request of a user. Since an arm 15 to be rotated by the pulse motor 15b in the horizontal surface is interposed between an arm 11 and a supporting body 14, the operating distance and range in the two-dimensional direction on the arm 13 front end are lengthened and widen, and work efficiency is enhanced, and the scalar-type robot can immediately respond thereto without changing the layout of desk-type robots 110a, 110b,... also in skipping one process with the change of the kind of a productive machine.