VEHICULAR LIGHTING

To provide a vehicular lighting enabling accurate and easy control of even emission in the width direction of a light guide.SOLUTION: Included are a light source 3 and an emission unit 2A which has a light guide 4A, and the light guide 4A has: an incidence part 6 for making light L, which has been radially emitted from the light source 3, incident inside while parallelizing the light L in a width direction; a first reflection part 11 for reflecting the light L, which has been incident from the incidence part 6 in a parallelized state, while diffusing the light L in the width direction; a second reflection part 12 for reflecting the light L, which has been reflected at the first reflection part 11 in a diffused state, while parallelizing the light L in the width direction; a third reflection part 13 for reflecting the light L, which has been reflected at the second reflection part 12 in a parallelized state, while diffusing the light L in the width direction; and an emission part 14 for outwardly emitting the light L which has been reflected at the third reflection part 13 in a diffused state.SELECTED DRAWING: Figure 6 【課題】導光体の幅方向における均一的な発光を高い精度でなお且つ容易に制御することを可能とした車両用灯具を提供する。【解決手段】光源３と、導光体４Ａとを有する発光ユニット２Ａを備え、導光体４Ａは、光源３から放射状に出射された光Ｌを幅方向において平行化しながら内部へと入射する入射部６と、入射部６から平行化した状態で入射した光Ｌを幅方向において拡散しながら反射する第１の反射部１１と、第１の反射部１１で拡散した状態で反射された光Ｌを幅方向において平行化しながら反射する第２の反射部１２と、第２の反射部１２で平行化した状態で反射された光Ｌを幅方向において拡散しながら反射する第３の反射部１３と、第３の反射部１３で拡散した状態で反射された光Ｌを外部へと出射する出射部１４とを有する。【選択図】図６