This light guide member has a light source arranged on one flank and the light of the light source is guided in the light guide member and emitted from the front while reflected and refracted; and the light guide member is formed by dispersing arborization molecules containing metal-based particles which are at least one of metal particles and alloy particles differing in refractive index from a transparent resin in the transparent resin. 一側面に光源を配置して、該光源の光を導光部材の中に導き、反射屈折させながら、正面から発光させる導光部材であって、前記導光部材が、透明樹脂に、該透明樹脂と屈折率の異なる金属粒子及び合金粒子の少なくともいずれかの金属系粒子を含有する樹状分岐分子を分散させてなる導光部材である。 - 特許庁