INDUSTRIAL ROBOT HAVING DUST-PROOF STRUCTURE

An industrial robot having a dust-proof structure is equipped with at least one dust cover (33,47) having an opening (34, 48) at one of its end portions and with a straightly moving unit (19, 37) extending through the opening of the dust cover and moved back and forth in a longitudinal direction. Suction is made by a suction unit (50) inside the dust cover so that the flow of air occurs from outside the dust cover into the same through the opening. A ring member (52, 56) is disposed at the opening of the dust cover in such a manner as to encompass the outer periphery of the straightly moving unit through a gap. At least one annular groove (55, 57) for air reservoir is disposed on the inner peripheral surface of the ring member so as to encompass the outer circumference of the straightly moving unit.