A wireless communication device includes: a case that includes a dielectric member made of a first dielectric material, the dielectric member being coated with a coating layer made of a second dielectric material; a wireless communication circuit that is housed in the case; an antenna element that is electrically connected to the wireless communication circuit, the antenna element being made of a conductive material and provided on a surface of the dielectric member; and an adhesive layer that is disposed between the antenna element and the dielectric member to adhere the antenna element onto the dielectric member, the adhesive layer being made of a third dielectric material.