In an antenna device including a plurality of antenna portions, it is made possible to arrange the mutual antenna portions close to each other in a limited space while suppressing degradation of respective characteristics. An antenna device 30 includes an antenna case 11 forming an accommodation space with an antenna base 18. In the accommodation space, a first antenna portion 12 and a second antenna portion 13 corresponding different frequencies from each other are accommodated. Each of the antenna portions 12 and 13 includes one or more elements, portion of the elements of the first antenna portion 12 overlaps portion of the elements of the second antenna portion 13 in at least one of side view and top view. A limiting circuit 31 is connected to a power feeding portion of at least one antenna portion of the first antenna portion 12 and the second antenna portion13. The limiting circuit 31 limits transmission of signals with frequencies outside a frequency band corresponded by the antenna portion.