An objective is to appropriately select a “timing reference cell” and a “Pathloss reference cell” for an Scell in an sTAG. A mobile station UE according to the present invention includes a second management unit 11B configured to use a “UL Cell” managed in association with a “DL only Cell” where to perform a downlink communication only, as a Pcell or an Scell in a pTAG.