An industrial robot having a plurality of units each consisting of a unit body provided with a movable block having a mounting surface, a side placed parallel to this movable block, exposing only small parts of its mounting surface, a mounting bottom extending perpendicular to this side and a guide which supports the aforementioned movable block in such a way that it is movable parallel to the mounting surface and in a straight line in a definite range, a driving device on the unit body to drive the movable block, and a control device for controlling this driving device, the plurality of units being coupled in such a way that the straight line moving directions of the movable blocks of each two coupled units are at a right angle. The units are connected through a mounting structure having a first mounting surface on the mounting surface of the movable block of one of the aforementioned units and a second mounting surface which makes a right angle to this first mounting surface and on which the mounting surface of the unit body of the other unit is placed, whereby various movements can be obtained by coupling of respective units through the mounting structure.