An industrial robot is provided with a horizontal multistage telescopic device. In the device, a slider is mounted to s base so as to be movable in a first direction and in a second direction which are opposite to each other along the horizontal direction. An output arm has an end in the second direction, the end being provided with an output arm support, and is expanded in the first direction from the output arm support. The output arm support is mounted to a slider so as to be horizontally movable in the first and second directions. The output arm has an end in the first direction, to which an end effector is mounted. A motor is mounted to an end of the slider in the second direction. A rotation transmitting member transmits torque of the motor to a second rotor of a movement mechanism.