To prevent reduction in effect of error correction.

When a packet retransmission request (NAK) is returned from a packet receiver side; a packet mixing part 301 mixes a plurality of retransmission packets corresponding to a plurality of retransmission requests retained in a retransmission buffer part 304, and makes a turbo encoding part 302 receive information bits obtained by the mixing as input. The turbo encoding part 302 executes turbo encoding on the input information bits, and, as a result, generates a turbo code including first and second parity bits as well as the information bits. A rate matching part 303 determines bits to be actually transmitted from the generated turbo code, to obtain a transmission signal.