A robot comprising: two links (41, 421-423); a joint portion (424-426) 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 (424-426); 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 (424-426) 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 (424-426), 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 (424-426) 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 (424-426); 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 (424-426) 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 (424-426), 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 (424-426) 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 (424-426), 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 . <EOS>