A transmission code processing device includes: a signal point arrangement shaping encoding unit to perform conversion into a shaped bit of mi column; a systematic error correction encoding unit to generate a parity bit of mp column based on the shaped bit; a first symbol mapping unit to convert the shaped bit into a first modulation symbol; a second symbol mapping unit to convert the parity bit into a second modulation symbol; and a symbol multiplexing unit to multiplex the first and second modulation symbols, in which the first modulation symbol has one element in a first signal point set including ci signal point including an origin, the second modulation symbol has one element in cp signal point not including the origin, and the signal point arrangement shaping encoding unit performs signal point arrangement shaping in which the first modulation symbol has one element in the first signal point set.