Dielectric sheets (31) each having a conductor film on one side are so stacked as to constitute at least one filter (2), so that a multilayer dielectric block (3) is produced. A radiation element (1) is provided on the laminated dielectric block (3), and one electrode of the filter (2) is electrically connected to the radiation element (1). The other electrode of the filter (2) is led out to the mount face (B) (the face opposite to a circuit board to be mounted) of the multilayer dielectric block (3) through a via contact (33) and a wiring (34) so as not to be exposed on the side face, and connected to a feeding terminal electrode (4) provided on the mount face. As a result, an antenna with a built-in filter of the structure where even if it is mounted on a circuit board, interference between an electronic circuit on the circuit board and the feeding terminal electrode of the antenna is prevented to improve the isolation characteristic and transmission/reception characteristic.