ANTENNA DEVICE

PROBLEM TO BE SOLVED: To provide an antenna device which effectively flows a high-frequency current to multiple antenna elements and suppresses influences of a peripheral component.SOLUTION: An antenna device includes: a substrate body; a ground surface GND patterned at the substrate body; a first element EL1 and a second element EL2. The ground surface has a ground major surface part G1 and a ground side part G2 protruding from the ground major surface part to a side part of a region where the first element and the second element are formed. The first element has a first extension part E1 extending from a feeding point FP in a direction that moves away from the ground major surface part and a second extension part E2 extending from a tip of the first extension part in a direction that moves away from the ground side part. The second element is connected with the ground side part at a base end, extends along the ground major surface part in a direction that moves away from the ground side part, and has a tip connected with the tip of the first extension part.