Provided is an antenna device that is capable of limiting a reduction in antenna gain. The present invention is provided with: a first substrate; a feeder line arranged on the first substrate; a grounding conductor arranged on the first substrate; a first radiating element electrically connected to the feeder line on the first substrate; a second radiating element arranged substantially parallel to the first radiating element and electrically connected to the grounding conductor on the first substrate; a first reflector arranged on the first substrate; and a second reflector arranged on the first substrate so as to be spaced away from the first radiating element or the second radiating element by a prescribed distance in the longitudinal direction of at least one of the first radiating element and the second radiating element.
