The present invention includes an excitation light source unit for generating pulsed excitation light, a sample optical unit for collecting an optical signal caused by irradiating a sample with pulsed excitation light, and a photoelectric conversion unit for generating an analog single photon signal by photoelectrically converting the optical signal. , An AD signal conversion unit that samples an analog single photon signal and converts it into a digital single photon signal, and generates a discrimination signal by discriminating the single photon of a digital single photon signal, and measures the pulse time of the digital single photon signal. It provides a time-resolved single photon counting device including a digital discrimination time measurement unit that generates a delay time signal having delay time information, and a time signal processor that counts an effective single photon detection event according to the delay time by referring to the discrimination signal. .
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