To provide a back mirror with which high visible light reflection is attainable and the greening of reflected light is eliminated.

The green reflected color of the back mirror produced by depositing a reflection layer 2 on two pieces of reflection intensifying layers 3, 4 on a glass substrate 1 is controlled by selecting the materials and thickness of the layers. The back mirror has the reflected color of ≥-6 in the value (a) and is capable of embodying visible light reflection of at least 65% and more preferably visible light reflection of at least 70%. The inner reflection intensifying layer 3 and the reflection layer 5 consist preferably of silicon. The inner reflection intensifying layer 3 have an optical thickness of ≤125nm and the intermediate reflection intensifying layer 4 is composed of silicon oxide and its optical thickness is specified to ≤125nm. This mirror is produced by successively depositing the layers 3, 4, 5 on a hot ribbon of glass during the production process for glass.