A mobile terminal, comprising: a bar type terminal body including a conductive case, and having an upper part and a lower part, wherein a display is disposed on the bar type terminal body; and an antenna device disposed on the lower part of the bar type terminal body, and configured to transmit and receive a radio signal, wherein the conductive case comprises a first conductive case and a second conductive case forming a side appearance of the mobile terminal, wherein the first conductive case is disposed at the lower part of the bar type terminal body, wherein the second conductive case is formed to cover a side surface of the mobile terminal rather than the first conductive case, wherein the first conductive case is separated from the second conductive case by an opening wherein the opening comprises a dielectric substance between the first conductive case and the second conductive case, wherein the antenna device comprises: a first member (310, 1110, 1110') and a second member (320, 1120, 1120') formed of a conductive material, the first and second members form a slot having an open part and a connection part connecting the first member (310, 1110, 1110') to the second member (320, 1120, 1120'), a feeding portion (330, 1130, 1130') to feed the antenna device for resonating at a first frequency band, a feeding extension portion (360, 1160, 1170') extending from the feeding portion and coupled to one surface of the second member (320, 1120, 1120') wherein the feeding extension portion is configured for impedance matching of the antenna device at a second frequency band, and a printed circuit board, PCB, including the second member (320, 1120, 1120'), wherein the first member (310, 1110, 1110') is a part of the first conductive case. a bar type terminal body including a conductive case, and having an upper part and a lower part, wherein a display is disposed on the bar type terminal body; and an antenna device disposed on the lower part of the bar type terminal body, and configured to transmit and receive a radio signal, wherein the conductive case comprises a first conductive case and a second conductive case forming a side appearance of the mobile terminal, wherein the first conductive case is disposed at the lower part of the bar type terminal body, wherein the second conductive case is formed to cover a side surface of the mobile terminal rather than the first conductive case, wherein the first conductive case is separated from the second conductive case by an opening wherein the opening comprises a dielectric substance between the first conductive case and the second conductive case, wherein the antenna device comprises: a first member (310, 1110, 1110') and a second member (320, 1120, 1120') formed of a conductive material, the first and second members form a slot having an open part and a connection part connecting the first member (310, 1110, 1110') to the second member (320, 1120, 1120'), a feeding portion (330, 1130, 1130') to feed the antenna device for resonating at a first frequency band, a feeding extension portion (360, 1160, 1170') extending from the feeding portion and coupled to one surface of the second member (320, 1120, 1120') wherein the feeding extension portion is configured for impedance matching of the antenna device at a second frequency band, and a printed circuit board, PCB, including the second member (320, 1120, 1120'), wherein the first member (310, 1110, 1110') is a part of the first conductive case. a first member (310, 1110, 1110') and a second member (320, 1120, 1120') formed of a conductive material, the first and second members form a slot having an open part and a connection part connecting the first member (310, 1110, 1110') to the second member (320, 1120, 1120'), a feeding portion (330, 1130, 1130') to feed the antenna device for resonating at a first frequency band, a feeding extension portion (360, 1160, 1170') extending from the feeding portion and coupled to one surface of the second member (320, 1120, 1120') wherein the feeding extension portion is configured for impedance matching of the antenna device at a second frequency band, and a printed circuit board, PCB, including the second member (320, 1120, 1120'), wherein the first member (310, 1110, 1110') is a part of the first conductive case.