A delay line-based time-to-digital converter according to an embodiment of the present invention comprises: a coarse counter for counting pulses of a timing clock so as to measure the time when an edge of an input signal is detected; a fine time interpolator including a delay line which includes a plurality of first delay elements and a plurality of second delay elements and into which the input signal is input, and a flip-flop unit into which outputs of the plurality of first delay elements or outputs of the plurality of second delay elements are input and which uses the timing clock as the operating frequency thereof; and a timestamp generation unit for receiving a digital value for the time measured by the coarse counter and the fine time interpolator, and creating a timestamp for the input signal using the received digital value.
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