A tag board includes an insulation substrate with a lower surface bonded to the outside and an upper surface including a recess, an upper surface conductor on the upper surface of the insulation substrate, a ground conductor on the lower surface of the insulation substrate, and a short-circuit-portion through conductor that penetrates the insulation substrate in the thickness direction and electrically connects the upper surface conductor and the ground conductor to each other. The short-circuit-portion through conductor is connected to the upper surface conductor only at a part of the periphery of the upper surface conductor.