PURPOSE: To provide a painting robot requiring no explosion-proof measure at a place requiring explosion-proofness, constituted so as not to coincide the axial line of the injection center of a painting gun with the central axial line of an arm holding the painting gun in a freely swingable manner.

CONSTITUTION: An arm 4 is attached to the leading end part of the moving lever 3, which is provided to a rail 2 in a freely movable manner, in a freely rotatable manner so as to cross the lever 3 at right angles and a painting gun 5 for injecting a solvent is attached to the arm in a freely movable manner. In this case, the gun 5 is attached so as not to always coincide the axial line L of the injection center thereof with the central axial line of the arm 4 in spite of the swinging thereof. Now, when the lever 3 is arranged along an X-axis to paint, for example, a P-region, the arm 4 is moved so as to bring the swinging point 5a of the gun 5 to the point (a) on the X-axis. In the next step, the gun 5 is swung to a counterclockwise direction and may be swung at an angle set so as to bring the axial line L thereof to the end part of the region R. In addition, in painting the region R present at the position symmetric to the X-axis, the arm 5 may be rotated by 180° from the initial position.