Antenna device

An antenna device comprising:

• a ground portion including a front surface;
• and
• a first element located on a side of the front surface, the first element supporting a predetermined frequency band, the first element including
• a main body portion facing the ground portion and spaced apart a predetermined distance from the ground portion in a first direction normal to the front surface, the main body portion having
• one end part and another end part opposite to each other in a second direction, and
• an open end portion extending in a third direction different from the first direction and the second direction,
• an extending portion extending from the one end part of the main body portion toward the ground portion, the extending portion having
• one end part located on a side of the one end part of the main body portion, and
• another end part including a facing portion, the facing portion having no contact with the front surface,
• a short-circuit portion extending from the another end part of the main body portion toward the ground portion, and
• a standing portion located on the another end part of the first main body portion, wherein
• in a plan view of the antenna device, the main body portion forms an L-shape having a long side and a short side, the standing portion being located on the long side, and the short-circuit portion being located on the short side and between the standing portion and the open end portion, and
• in a side view of the antenna device, the facing portion includes a portion located at a same position as a position of a back surface of the ground portion.