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A half mirror includes an observation surface, a molded resin layer, and a polarization reflection plate in this order, at least one high-Re retardation film is included between the observation surface and the polarization reflection plate, a total front phase difference of the high-Re retardation film is 3, 000 nm or greater, and a first high-Re retardation film is included as the high-Re retardation film between the observation surface and the molded resin layer.