A robot comprising: two links (41, 421-423); a joint portion that connects the two links (41, 421-423) so as to be rotatable relative to each other; a control unit that is configured so as to control an operation of the joint portion; and an optical transmission device that is configured to transmit an optical signal between the two links (41, 421-423), the optical transmission device comprising: an optical wiring that allows an optical signal to propagate; and a light source unit that emits the optical signal, wherein the optical wiring of the optical transmission device passes through the joint portion and allows the optical signal to propagate, and the light source unit of the optical transmission device is disposed on one of the two links (41, 421-423) and emits the optical signal, characterised in that the control unit is configured to transmit a signal for adjusting intensity of the optical signal according to operation information of the joint portion, which is information predicting a bending amount of the optical wiring, to the optical transmission device, and the optical transmission device is configured to adjust an intensity of the optical signal according to the so predicted bending amount of the optical wiring. two links (41, 421-423); a joint portion that connects the two links (41, 421-423) so as to be rotatable relative to each other; a control unit that is configured so as to control an operation of the joint portion; and an optical transmission device that is configured to transmit an optical signal between the two links (41, 421-423), the optical transmission device comprising: an optical wiring that allows an optical signal to propagate; and a light source unit that emits the optical signal, wherein the optical wiring of the optical transmission device passes through the joint portion and allows the optical signal to propagate, and the light source unit of the optical transmission device is disposed on one of the two links (41, 421-423) and emits the optical signal, characterised in that the control unit is configured to transmit a signal for adjusting intensity of the optical signal according to operation information of the joint portion, which is information predicting a bending amount of the optical wiring, to the optical transmission device, and the optical transmission device is configured to adjust an intensity of the optical signal according to the so predicted bending amount of the optical wiring. an optical wiring that allows an optical signal to propagate; and a light source unit that emits the optical signal, wherein the optical wiring of the optical transmission device passes through the joint portion and allows the optical signal to propagate, and the light source unit of the optical transmission device is disposed on one of the two links (41, 421-423) and emits the optical signal, characterised in that the control unit is configured to transmit a signal for adjusting intensity of the optical signal according to operation information of the joint portion, which is information predicting a bending amount of the optical wiring, to the optical transmission device, and the optical transmission device is configured to adjust an intensity of the optical signal according to the so predicted bending amount of the optical wiring.