Appropriate CC-to-TAG mapping is configured when “UL CA” is performed. A mobile station UE of the invention includes: a management unit 11 configured to manage one or more TAGS; an adjustment unit 12 configured to make adjustment to synchronize transmission timings of uplink signals within CCs which belong to the same TAG; and a transmission unit 13 configured to notify a radio base station eNB of a combination of supported bands, supported CCs, and settable TAGS, and the bands and the CCs grouped in the TAGs included in the combination.