Provided is a dual band antenna including: a ground surface; a feeder feeding a predetermined current; an induction radiator including one end connected to the ground surface and the other end connected to the feeder; and a parasitic radiator including an end connected to the ground surface and the other end opened. An antenna having a smaller size than an existing IFA mainly used as an internal antenna in a portable terminal can be provided through the dual band antenna including the induction radiator and the parasitic radiator.