An antenna apparatus comprising: a substrate; an antenna ground arranged on the substrate, wherein sides of the antenna ground define a rectangular antenna region on the substrate that is not covered by the antenna ground; and a multi-band antenna capable to operate in a plurality of frequency bands, wherein the multi-band antenna is formed on the substrate in the antenna region, and the multi-band antenna comprises: a feeding point (201, 1601, 1801, 2101, 2301); a first conductor (202, 1602, 1802, 2102, 2302) which is connected to the feeding point; and two second conductors (203, 204, 1603, 1604, 1803, 1804, 2103, 2104, 2303, 2304) which are branched from the first conductor, have a linear shape comprising respective linear parts, and include open ends as ends on a side on which the second conductors (203, 204, 1603, 1604, 1803, 1804, 2103, 2104, 2303, 2304) are not connected to the first conductor (202, 1602, 1802, 2102, 2302), wherein the open ends of the two second conductors face in substantially the same direction parallel to a first one of the sides of the antenna region, wherein said first side is located closest to the feeding point among the sides of the antenna region, the respective linear parts of the two second conductors include a respective first part and a respective second part; the first parts and the second parts of the two second conductors are parallel to each other and parallel to the first side; a distance between the first parts of the two second conductors is a first distance (a), and a distance between the second parts of the two second conductors is a second distance (d) shorter than the first distance, the two second conductors are electromagnetically coupled at, at least, the second part, each of the two second conductors comprises respective bends; characterized in that a side of the antenna ground faces the open ends of the two second conductors. a substrate; an antenna ground arranged on the substrate, wherein sides of the antenna ground define a rectangular antenna region on the substrate that is not covered by the antenna ground; and a multi-band antenna capable to operate in a plurality of frequency bands, wherein the multi-band antenna is formed on the substrate in the antenna region, and the multi-band antenna comprises: a feeding point (201, 1601, 1801, 2101, 2301); a first conductor (202, 1602, 1802, 2102, 2302) which is connected to the feeding point; and two second conductors (203, 204, 1603, 1604, 1803, 1804, 2103, 2104, 2303, 2304) which are branched from the first conductor, have a linear shape comprising respective linear parts, and include open ends as ends on a side on which the second conductors (203, 204, 1603, 1604, 1803, 1804, 2103, 2104, 2303, 2304) are not connected to the first conductor (202, 1602, 1802, 2102, 2302), wherein the open ends of the two second conductors face in substantially the same direction parallel to a first one of the sides of the antenna region, wherein said first side is located closest to the feeding point among the sides of the antenna region, the respective linear parts of the two second conductors include a respective first part and a respective second part; the first parts and the second parts of the two second conductors are parallel to each other and parallel to the first side; a distance between the first parts of the two second conductors is a first distance (a), and a distance between the second parts of the two second conductors is a second distance (d) shorter than the first distance, the two second conductors are electromagnetically coupled at, at least, the second part, each of the two second conductors comprises respective bends; characterized in that a side of the antenna ground faces the open ends of the two second conductors. a feeding point (201, 1601, 1801, 2101, 2301); a first conductor (202, 1602, 1802, 2102, 2302) which is connected to the feeding point; and two second conductors (203, 204, 1603, 1604, 1803, 1804, 2103, 2104, 2303, 2304) which are branched from the first conductor, have a linear shape comprising respective linear parts, and include open ends as ends on a side on which the second conductors (203, 204, 1603, 1604, 1803, 1804, 2103, 2104, 2303, 2304) are not connected to the first conductor (202, 1602, 1802, 2102, 2302), wherein the open ends of the two second conductors face in substantially the same direction parallel to a first one of the sides of the antenna region, wherein said first side is located closest to the feeding point among the sides of the antenna region, the respective linear parts of the two second conductors include a respective first part and a respective second part; the first parts and the second parts of the two second conductors are parallel to each other and parallel to the first side; a distance between the first parts of the two second conductors is a first distance (a), and a distance between the second parts of the two second conductors is a second distance (d) shorter than the first distance, the two second conductors are electromagnetically coupled at, at least, the second part, each of the two second conductors comprises respective bends; characterized in that a side of the antenna ground faces the open ends of the two second conductors.