A transmission device including a pulse generating section configured to generate a plurality of pulses using a signal of data and a signal obtained by delaying the signal of data, and to adjust the pulse width such that each of the plurality of pulses has a pulse width conforming to a sequence of the data; a band-pass filter filtering the plurality of pulses; and a transmission amplifier amplifying the filtered plurality of pulses and outputting the filtered plurality of pulses as a transmission signal.