An RF tag that includes an inlay (made of an IC chip and an antenna); an auxiliary antenna laminated on the inlay in an insulated state; and a housing that houses the inlay having the auxiliary antenna laminated thereon. Furthermore, the antenna of the inlay forms a loop circuit adjacent to the IC chip, and the auxiliary antenna overlaps part of the loop circuit and is arranged along a longitudinal direction of the inlay such that at least a part of the antenna of the inlay is exposed.