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