The fixed unit (90) of the light guide member (81) is a space area (in which the protective member (83) and the holding member (85) are separated from each other in the longitudinal axis direction of the fixed unit (90) Bonding for adhering at least a part of the protection member (83) and at least a part of the holding member (85) to the definition member (91) disposed in the space area (91) and the definition member (91) having 91a) And an agent (93). The defining member (91) defines the bonding range of the adhesive (93) in at least one of the longitudinal axis direction and the radial direction of the defining member (91).導光部材（８１）の固定ユニット（９０）は、保護部材（８３）と保持部材（８５）とが固定ユニット（９０）の長手軸方向において互いに対して離れた状態で配置される空間領域（９１ａ）を有する規定部材（９１）と、空間領域（９１）に配置されて保護部材（８３）の少なくとも一部と保持部材（８５）の少なくとも一部とを規定部材（９１）に接着する接着剤（９３）とを有する。規定部材（９１）は、規定部材（９１）の長手軸方向と径方向との少なくとも一方における接着剤（９３）の接着範囲を規定する。
