An input device includes a signal generator configured to generate a waveform signal; a transmission line including a first end connected to the signal generator and a second end on an opposite side of the first end, and configured to transmit the waveform signal; a termination connected to the second end of the transmission line; and a position determination unit configured to determine, based on an input signal that is the waveform signal and input from the signal generator to the transmission line and a reflected signal generated by the input signal being reflected toward the first end by an object becoming proximate to the transmission line between the first end and the second end of the transmission line, a proximate position where the object is proximate to the transmission line.