To provide a selective light reflecting body, a specific polarized light radiation apparatus and an authenticity determination system which have high forgery prevention effect and in which the presence of a forgery prevention means cannot be recognized by other persons.

A selective light reflecting layer 11 which at least partially comprises a selective light reflecting part which reflects light in a specific polarized state in incident light and transmit other light is provided. When the selective light reflecting layer 11 is irradiated with light which does not include the specific polarized state, the selective light reflecting part transmits the light, thereby the selective light reflection part is no longer visible.

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