An industrial robot, having an end-effector supporting mechanism for holding an end-effector and accommodating an imaging device of a visual sensor, which is free from the interference with the periphery and capable of taking an image of the working position. A container-shaped adaptor of the end-effector supporting mechanism is attached to a distal end of a wrist flange provided in a robot wrist supported by a robot arm. The adaptor has a first attachment section provided with a first attachment surface to be attached to the wrist flange, and a second attachment section provided with a second attachment surface disposed generally parallel to a wrist flange surface at a position apart from the first attachment section by a predetermined distance along a rotary center axis of the wrist flange. On the second attachment surface, a tool holding member of the end-effector supporting mechanism for holding the working tool is attached.