An articulated robot comprising a plurality of units coupled in order from a proximal end of the articulated robot to a distal end of the articulated robot, the plurality of units including: different types of joint units, each joint unit including a stationary body (21, 41), a stationary body-side mechanical connector (30, 50) provided in the stationary body (21, 41) for mechanical connection to another unit of the plurality of units, a displaceable body (22, 42) coupled to the stationary body (21, 41) by a coupler, a displaceable body-side mechanical connector (31, 51) provided in the displaceable body (22, 42) for mechanical connection to another unit of the plurality of units, and an actuator (25, 45) configured to displace the displaceable body (22, 42) relative to the stationary body (21, 41); and a control unit including a controller configured to control the actuator (25, 45) and a control unit mechanical connector for mechanical connection to another unit of the plurality of units, wherein the stationary body-side mechanical connector (30, 50) includes a first connection structure, the displaceable body-side mechanical connector (31, 51) and the control unit mechanical connector each include a second connection structure, and the first connection structure and the second connection structure are connectable to each other, characterized in that displacement undergone by the displaceable body-side mechanical connector (31, 51) relative to the stationary body-side mechanical connector (30, 50) upon displacement of the displaceable body (22, 42) relative to the stationary body (21, 41) differs depending on the type of the joint unit, and in that each of the different types of joint units and the control unit includes a notifier (18, 36, 56) configured to provide a notification that allows distinguishing whether the unit is in a normal state or an abnormal state. the plurality of units including: different types of joint units, each joint unit including a stationary body (21, 41), a stationary body-side mechanical connector (30, 50) provided in the stationary body (21, 41) for mechanical connection to another unit of the plurality of units, a displaceable body (22, 42) coupled to the stationary body (21, 41) by a coupler, a displaceable body-side mechanical connector (31, 51) provided in the displaceable body (22, 42) for mechanical connection to another unit of the plurality of units, and an actuator (25, 45) configured to displace the displaceable body (22, 42) relative to the stationary body (21, 41); and a control unit including a controller configured to control the actuator (25, 45) and a control unit mechanical connector for mechanical connection to another unit of the plurality of units, wherein different types of joint units, each joint unit including a stationary body (21, 41), a stationary body-side mechanical connector (30, 50) provided in the stationary body (21, 41) for mechanical connection to another unit of the plurality of units, a displaceable body (22, 42) coupled to the stationary body (21, 41) by a coupler, a displaceable body-side mechanical connector (31, 51) provided in the displaceable body (22, 42) for mechanical connection to another unit of the plurality of units, and an actuator (25, 45) configured to displace the displaceable body (22, 42) relative to the stationary body (21, 41); and a control unit including a controller configured to control the actuator (25, 45) and a control unit mechanical connector for mechanical connection to another unit of the plurality of units, wherein the stationary body-side mechanical connector (30, 50) includes a first connection structure, the displaceable body-side mechanical connector (31, 51) and the control unit mechanical connector each include a second connection structure, and the first connection structure and the second connection structure are connectable to each other, characterized in that displacement undergone by the displaceable body-side mechanical connector (31, 51) relative to the stationary body-side mechanical connector (30, 50) upon displacement of the displaceable body (22, 42) relative to the stationary body (21, 41) differs depending on the type of the joint unit, and in that each of the different types of joint units and the control unit includes a notifier (18, 36, 56) configured to provide a notification that allows distinguishing whether the unit is in a normal state or an abnormal state.