Priority control is performed using FPIs. A radio base station eNB according to the present invention includes: a bearer management unit 12 configured to manage FPIs assigned to data flows received from a core network device S-GW via an S1 bearer; and a priority control unit 13 configured to perform priority control over the data flows received from the core network device S-GW via the S1 bearer, in which the bearer management unit 12 establishes a radio bearer with a mobile station UE for each of the FPIs, and the priority control unit 13 transfers each data flow received from the core network device S-GW via the S1 bearer, to the radio bearer corresponding to the FPI assigned to the data flow.