To provide an IC-tagged bearing device, in which difficulties brought about by reflection and/or absorption of radio waves upon and/or in raceway members or the like can be avoided, information recording can be accomplished satisfactorily, an IC tag itself does not require an antenna, and the IC tag can have a compact, yet large capacity. The bearing device, having a bearing space delimited between inner and outer races (1, 2) and sealed by a sealing member (5), includes an IC tag (9) which utilizes a core metal (6) as an antenna and which is fitted to the sealing member (5). The sealing member (5) is made of a rubber material or a synthetic resin having the core metal (6).