A robot with a downsized joint unit is disclosed. The articulated robot includes a motor which is provided with a gear or a pulley at an end of a motor shaft, and which generates a force for driving a joint, a speed reduction mechanism which reduces the speed of rotation of the gear or pulley rotating integrally with the motor shaft, and a supporting member which supports the motor and the speed reduction mechanism, and which defines an interior space for accommodating the motor, wherein the supporting member has an opposing face opposing the motor in the interior space and spreading in a plane perpendicular to the motor shaft, and the opposing face includes a groove-like recessed portion recessed in a protruding direction of the motor shaft and extending in a direction perpendicular to the motor shaft.
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