An antenna element (20, 20A, 20B) for forming an antenna device (10, 10A-E) by being mounted on a ground conductor (40, 40A, 40B) via a dielectric body, wherein: the antenna element (20, 20A, 20B) comprises an upper conductor (221, 221A-C), at least one first lower conductor (241, 241A, 241B), at least one second lower conductor (243, 243A, 243B), at least one first leg portion (223, 223A, 223B), at least one second leg portion (225, 225A, 225B) and at least one feeding portion (227, 227A, 227B); the upper conductor (221, 221A-C) has a middle portion (231, 231A, 231C), a ring portion (233, 233A, 233C) and a coupling portion (235, 235A, 235C); the ring portion (233, 233A, 233C) is located apart from the middle portion (231, 231A, 231C) and continuously surrounds the middle portion (231, 231A, 231C); the coupling portion (235, 235A, 235C) couples the middle portion (231, 231A, 231C) and the ring portion (233, 233A, 233C) to each other; the at least one first leg portion (223, 223A, 223B) extends from the middle portion (231, 231A, 231C); the at least one second leg portion (225, 225A, 225B) extends from the ring portion (233, 233A, 233C); the at least one first lower conductor (241, 241A, 241B) is apart from the upper conductor (221, 221A-C) in an up-down direction and connected to the at least one first leg portion (223, 223A, 223B); the at least one second lower conductor (243, 243A, 243B) is distinct and separated from the at least one first lower conductor (241, 241A, 241B) and is apart from the at least one first lower conductor (241, 241A, 241B); the at least one second lower conductor (243, 243A, 243B) is apart from the upper conductor (221, 221A-C) in the up-down direction and connected to the at least one second leg portion (225, 225A, 225B); the at least one feeding portion (227, 227A, 227B) extends from the upper conductor (221, 221A-C); the at least one first lower conductor (241, 241A, 241B) and the at least one first leg portion (223, 223A, 223B) are the same as each other in number and connected to each other in a one-to-one relationship; and the at least one second lower conductor (243, 243A, 243B) and the at least one second leg portion (225, 225A, 225B) are the same as each other in number and connected to each other in a one-to-one relationship, the at least one first lower conductor and the at least one second lower conductor are configured to be each capacitively connected to a ground conductor. the antenna element (20, 20A, 20B) comprises an upper conductor (221, 221A-C), at least one first lower conductor (241, 241A, 241B), at least one second lower conductor (243, 243A, 243B), at least one first leg portion (223, 223A, 223B), at least one second leg portion (225, 225A, 225B) and at least one feeding portion (227, 227A, 227B); the upper conductor (221, 221A-C) has a middle portion (231, 231A, 231C), a ring portion (233, 233A, 233C) and a coupling portion (235, 235A, 235C); the ring portion (233, 233A, 233C) is located apart from the middle portion (231, 231A, 231C) and continuously surrounds the middle portion (231, 231A, 231C); the coupling portion (235, 235A, 235C) couples the middle portion (231, 231A, 231C) and the ring portion (233, 233A, 233C) to each other; the at least one first leg portion (223, 223A, 223B) extends from the middle portion (231, 231A, 231C); the at least one second leg portion (225, 225A, 225B) extends from the ring portion (233, 233A, 233C); the at least one first lower conductor (241, 241A, 241B) is apart from the upper conductor (221, 221A-C) in an up-down direction and connected to the at least one first leg portion (223, 223A, 223B); the at least one second lower conductor (243, 243A, 243B) is distinct and separated from the at least one first lower conductor (241, 241A, 241B) and is apart from the at least one first lower conductor (241, 241A, 241B); the at least one second lower conductor (243, 243A, 243B) is apart from the upper conductor (221, 221A-C) in the up-down direction and connected to the at least one second leg portion (225, 225A, 225B); the at least one feeding portion (227, 227A, 227B) extends from the upper conductor (221, 221A-C); the at least one first lower conductor (241, 241A, 241B) and the at least one first leg portion (223, 223A, 223B) are the same as each other in number and connected to each other in a one-to-one relationship; and the at least one second lower conductor (243, 243A, 243B) and the at least one second leg portion (225, 225A, 225B) are the same as each other in number and connected to each other in a one-to-one relationship, the at least one first lower conductor and the at least one second lower conductor are configured to be each capacitively connected to a ground conductor.