To provide an antenna device dealing with portable telephone set and short distance radio communication which is small in occupancy volume and weight, stable in characteristics and large in specific frequency band width.

A non-parallel antenna of a dipole configuration is formed of a pair of conductive wires having a power feeding part at their central part, and an electromagnetic interfering material extended inward is arranged closely near the top end parts of the pair of conductive wires. Thus, the antenna device dealing with dual bands can be composed of two sets of antennas of dipole configuration arranged inside and outside. When the antenna device is used in a metallic housing, an open hole part whose outer dimension is equivalent to that of the antenna is formed in one part of the metallic housing.