A deformed folded dipole antenna includes: a feed-side parallel part; a non-feed side parallel part arranged to be parallel to the feed-side parallel part; and a pair of short circuit portions respectively connecting to both ends of the feed-side parallel part and both ends of the non-feed side parallel part. The non-feed side parallel part includes: a pair of opposite sides that are arranged to be opposite from each other; and a connecting side that connects one ends of the pair of opposite sides together. The feed-side parallel part includes a first L-shaped portion and a second L-shaped portion. At least one of the feed-side parallel part and the non-feed side parallel part has one portion arranged with an inward protruding part, which protrudes inwardly.