ANTENNA DEVICE

PROBLEM TO BE SOLVED: To provide an antenna device in which a high frequency current can be fed effectively to a plurality of antenna elements while suppressing the influence of the peripheral components.SOLUTION: The antenna device includes a substrate body, a ground surface GND patterned on the substrate body, and a plurality of antenna elements EL1-EL4. The plurality of antenna elements are divided to first through six extensions E1-E6 extending from a feeding point FP in two directions different from each other, and connected therewith. The antenna device further includes a first ground connection having the proximal end connected with the ground surface and the distal end connected to the way of the first extension, a second ground connection having the proximal end connected with the ground surface and the distal end connected to the way of the sixth extension, and a coupling pattern L1 extending while coupling the first proximal end and the second proximal end. In the vicinity of the feeding point, an annular opening pattern S1 is formed between the coupling pattern and the first extension and the sixth extension.