To provide an antenna device which can obtain a high directivity even in a desired direction different from the extending direction of a magnetic material with a coil wound thereon, and be made compact and thin.

The antenna device is provided with a bar-like resonating magnetic material part 13 in which a coil part 12 is formed by winding a conductor 11 connected to a power feed part, and directional magnetic material parts 14 disposed projectingly from the resonating magnetic material part 13 in a direction different from a direction in which the conductor 11 is woundly advanced. Thus, the antenna device can obtain a strong directivity even in the direction in which the directional magnetic material parts 14 are projected.