disclosed is an antenna device or the like having a split ring resonator that adapts to different frequency bands . an antenna device has a laminated structure that is composed by alternating dielectric layers and conductor layers and that includes a plurality of structures each comprising : a first split ring that is formed in a first conductor layer extending along one surface of a dl , surrounds an opening and has a first split formed in a circumferential portion along the opening ; a second split ring that is formed in a second conductor layer , which extends along the other surface of the dl , in such a manner that the second sr is opposed to the first sr , the second sr surrounding the opening and having a second split formed in a circumferential portion along the opening ; a plurality of conductor vias that are circumferentially formed at intervals , sandwich the first sp and second sp and electrically connect the first sr to the second sr ; and a feeder line that is formed in a particular one of the cls and has one end electrically connected to at least one of the cvs and the other end insulated from the particular cl by a clearance formed in the particular cl along the extending direction of the particular cl .