A delay line has a high response speed by minimizing the amount of loading on an input node and an output node while delaying an input signal over a wide variation range. The delay line includes a forward delay unit configured to determine the length of a forward delay path passing an input signal in response to a delay control code, a reverse delay unit configured to receive an output signal of the forward delay unit, and to output a delayed input signal through a reverse delay path that is as long as the length of the forward delay path determined by the delay control code, and a transfer unit configured to transfer the output signal of the forward delay unit from a turn point determined by the delay control code to the reverse delay unit.