To provide a digital signal transmitter capable of reducing power consumption in sending a digital signal.

An encoder 39 generates a digital signal T1 whose lever is switched between 1st and 2nd levels in a timing when a toggle produced in digital signals D1, D4 is detected at the same time. The encoder generates digital signals D7, D11 with the same initial state level as that of the signals D1, D4 and whose levels are switched in a timing except the detected toggle timing among toggle timings produced in the digital signals D1, D4 and gives them to a destination decoder 60 via signal transmission lines 61, 62, 63.