To increase the degrees-of-freedom of work by a desk-top robot, and to improve the rigidity.

Supporting rails 14 and 15 are provided on both sides of a work table 10, and fitting grooves 16 and 17 are formed on the supporting rails 14 and 15. Stays 22 and 23 are fitted to the supporting rails 14 and 15 via an attachable/detachable pedestal 20, and an X-direction rail 31 with an X-direction block 31a fitted thereto in a reciprocating manner is fitted to the stays 22 and 23. A Y-direction rail 32 with a Y-direction block 32a fitted thereto in a reciprocating manner is fitted to the work table 10, and a Z-direction rail 33 with a Z-direction block 33a fitted thereto in a reciprocating manner is fitted to the X-direction block. A predetermined work is performed to a work by a working tool fitted to the Z-direction block 33a.