A biometric antenna device of the present invention comprises: a conductor layer (401) configured to face the measurement site (90) to transmit and / or receive the radio wave; and a dielectric layer (402) which is applied along an opposite surface (401b) of the conductor layer or a base material carrying the conductor layer and which extends parallel to the conductor layer and extends parallel to the conductor layer, the dielectric layer (402) having a predetermined relative Has dielectric constant. The dielectric layer (402) keeps a distance between an outer surface (90a) of the measuring point (90) and the conductor layer (401) constant in an attached state, in which a second surface (402b) on one side opposite to a side of a first surface (402a) abuts on one side along the conductor layer (401) of the dielectric layer (402) on an outer surface (90a) of the measuring point (90).
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