A parallel precoder circuit executes an EXOR operation on an n-row parallel input, and outputs an n-row parallel output, where 2.ltoreq.n. Outputs of EXOR circuits each of which having a largest column number from among EXOR circuits disposed in first to (n-1)th rows become first-row to (n-1)th-row parallel outputs, respectively. A output of an nth-row delay circuit becomes an nth-row parallel output.
