In an on-vehicle antenna device (1), an on-vehicle antenna device (10) which is provided at an end part of a roof (20) includes an antenna (11) which has antenna elements (14, 15) drawn out from one feed point (13a) in a first direction and drawn out from another feed point (13b) in a second direction. The first direction is direction intersecting with a horizontal plane in accordance with the on-vehicle antenna device (10) is mounted on a vehicle body (1).