An array antenna device is capable of ensuring isolation among the electric elements adequately in a simple structure and capable of moving under a planarity of frequency bands. The array antenna device has a power supply element (1, 2) and a non power supply element (5) respectively coupled to a capacitor of the power supply element (1, 2), which forms the power supply element (1, 2) that is substantially resonant in independent way under the frequency of high frequency and that is a circular antenna substantially resonant having regulated electric length formed by the power supply element (1, 2) and the non power supply element (5) under frequency of low frequency.