The present invention is designed so that uplink transmission is carried out adequately even when CA to apply different duplex modes between multiple cells is executed. A user terminal communicates with an FDD cell and a TDD cell by employing carrier aggregation, and has a receiving section that receives DL signals transmitted from each cell, and a feedback control section that allocates delivery acknowledgement signals in response to the DL signals received, by allocating the delivery acknowledgment signals in a predetermined UL subframe, and, regardless of the cell that is configured as the primary cell, when UL subframes are configured in both the FDD cell and the TDD cell, the feedback control section feeds back the delivery acknowledgement signals by using a UL subframe of one or both of the cells, and, when a UL subframe is configured only in the FDD cell, the feedback control section feeds back the delivery acknowledgement signals by using the UL subframe of the FDD cell.