PURPOSE:To remarkably increase rigidity of an orthogonal module by providing, on a slide base member, a plurality of roller members which are capable of making self-rotation and brought in contact with the peripheral surface of a frame member so as to position the frame member. CONSTITUTION:A hollow frame member 1 having a predetermined cross sectional shape is surrounded by a sliding base member 2. A plurality of roller members 3a, 3b, 3c are provided to make contact with the peripheral surface of the frame member 1 and position the frame member 1, and a rotating force is fed to at least one of the roller members, e.g. the roller member 3a, by a rotation driving power source 4. Thereby the slide base member 2 is slid to a desired position. Further, the rigidity of the frame member 1 is sufficiently increased and light weighted by forming the frame member 1 in one body and setting the cross sectional shape thereof In convenience.
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