A mobile terminal, comprising: a terminal body having an upper part and a lower part; an antenna device disposed on the upper part or the lower part of the terminal body, and configured to transmit and receive radio signals; the antenna device comprising a first member (310, 410, 510, 610, 710, 810, 910, 1110, 1210, 1310, 1410, 1510) and a second member (320, 420, 520, 620, 720, 820, 920, 1120, 1220, 1320, 1420, 1520) which form a first slot having an open part which is open and a connection part which is closed; a third member (370, 470, 570, 670, 1270, 1570) extending and bending from the end of the first or second member with a prescribed length so as to form a second slot; a feeding portion (330, 430, 530, 630, 730, 830, 930, 1130, 1230, 1330, 1430, 1530) having one end connected to one of the first member and the second member and forming an electric field in the first slot; and a feeding extension portion (360, 460, 560, 660, 760, 860, 960, 1160, 1260, 1360, 1460, 1560) extending from the feeding portion, wherein the feeding portion is displaced at a position where an impedance is a predetermined ohm, when operating in a first frequency band, wherein the feeding extension portion extends from the feeding portion by a predetermined length so that an impedance can be a predetermined ohm, when operating in a second frequency band, wherein an opening of the first slot and an opening of the second slot are formed in direction opposite to each other, and wherein the second slot is adapted to resonate at a third frequency adjacent to the frequency of the second frequency band so that the third member extends a bandwidth of the second frequency band. a terminal body having an upper part and a lower part; an antenna device disposed on the upper part or the lower part of the terminal body, and configured to transmit and receive radio signals; the antenna device comprising a first member (310, 410, 510, 610, 710, 810, 910, 1110, 1210, 1310, 1410, 1510) and a second member (320, 420, 520, 620, 720, 820, 920, 1120, 1220, 1320, 1420, 1520) which form a first slot having an open part which is open and a connection part which is closed; a third member (370, 470, 570, 670, 1270, 1570) extending and bending from the end of the first or second member with a prescribed length so as to form a second slot; a feeding portion (330, 430, 530, 630, 730, 830, 930, 1130, 1230, 1330, 1430, 1530) having one end connected to one of the first member and the second member and forming an electric field in the first slot; and a feeding extension portion (360, 460, 560, 660, 760, 860, 960, 1160, 1260, 1360, 1460, 1560) extending from the feeding portion, wherein the feeding portion is displaced at a position where an impedance is a predetermined ohm, when operating in a first frequency band, wherein the feeding extension portion extends from the feeding portion by a predetermined length so that an impedance can be a predetermined ohm, when operating in a second frequency band, wherein an opening of the first slot and an opening of the second slot are formed in direction opposite to each other, and wherein the second slot is adapted to resonate at a third frequency adjacent to the frequency of the second frequency band so that the third member extends a bandwidth of the second frequency band.