To specify flexibly one or more downlink component carriers for which a mobile station apparatus generates channel state information when performing communication using a plurality of component carriers complexly. A base station apparatus transmits to the mobile station apparatus a downlink control information format in which an information bit set to a value corresponding to one or more downlink component carriers requesting to report channel state information is included, and which is used for scheduling of a physical uplink shared channel, and the mobile station apparatus reports the channel state information for the one or more downlink component carriers to the base station apparatus using the physical uplink shared channel in accordance with the value set to the information bit, and a correspondence between a value set to the information bit and the one or more downlink component carriers is set in the mobile station apparatus by the base station apparatus using a signal of a higher layer.