| abstract |
(57) An object of the present invention is to provide a reflecting mirror which does not require a resin underlayer for smoothing as a reflecting mirror and has a surface smoothness that sufficiently reflects light. SOLUTION: The surface roughness of the inner surface of a base material 1 of Al or Al alloy formed in a concave curved surface shape is center line average roughness Ra ≦. 0.02 μm and maximum roughness Rmax ≦ 0.15 μm (cutoff value: 0.08 mm). By doing so, the inner surface of the base material of Al or Al alloy is smooth and glossy in appearance, and it becomes a reflecting mirror having specularity and high regular reflectance. Also, by using the surface of the base material of Al or Al alloy itself as a reflecting surface, the heat-resistant temperature of the reflecting mirror can be set to Al. Alternatively, the temperature can be raised to the recrystallization temperature of the Al alloy. |