Abstract: The present invention relates to an antenna including: a resin-made member to be attached to a vehicle body; an antenna element which is provided in the resin-made member and has a first length capable of resonating with a first frequency band; and a passive element which is provided in the resin-made member, capacitively coupled with the antenna element via a capacitive coupling portion, and has at least a region of a second length capable of resonating with a second frequency band which is different from the first frequency band by combining the second length with the first length of the antenna element.