A quantum cryptographic communication system comprising: a key integrated management device; a plurality of quantum cryptography devices; and a plurality of key management inspection devices, wherein each of the plurality of key management inspection devices inspects a quantum cryptographic key generated by one of the plurality of quantum cryptography devices, and each of the plurality of key management inspection devices includes at least: an inspection-target-value calculating unit that calculates an inspection target value based on quantum cryptography device information related to a quantum cryptography device, characterized by an expected-value calculating unit that calculates an expected value based on at least one of wiring information of a quantum cryptographic key distribution link connected to the quantum cryptography device to be inspected, weather information of a site installed with the quantum cryptography device to be inspected, and the quantum cryptography device information, a permissible-value calculating unit that calculates a permissible value based on at least one of the wiring information, the weather information, and the quantum cryptography device information, and a determining unit that determines whether or not the inspection target value is within a range of (the expected value)-(the permissible value) and within a range of (the expected value)+(the permissible value), and when the inspection target value is outside the range of (the expected value)-(the permissible value) and outside the range of (the expected value)+(the permissible value), transmits anomaly detection to the key integrated management device. a key integrated management device; a plurality of quantum cryptography devices; and a plurality of key management inspection devices, wherein each of the plurality of key management inspection devices inspects a quantum cryptographic key generated by one of the plurality of quantum cryptography devices, and each of the plurality of key management inspection devices includes at least: an inspection-target-value calculating unit that calculates an inspection target value based on quantum cryptography device information related to a quantum cryptography device, characterized by an expected-value calculating unit that calculates an expected value based on at least one of wiring information of a quantum cryptographic key distribution link connected to the quantum cryptography device to be inspected, weather information of a site installed with the quantum cryptography device to be inspected, and the quantum cryptography device information, an inspection-target-value calculating unit that calculates an inspection target value based on quantum cryptography device information related to a quantum cryptography device, characterized by an expected-value calculating unit that calculates an expected value based on at least one of wiring information of a quantum cryptographic key distribution link connected to the quantum cryptography device to be inspected, weather information of a site installed with the quantum cryptography device to be inspected, and the quantum cryptography device information, a permissible-value calculating unit that calculates a permissible value based on at least one of the wiring information, the weather information, and the quantum cryptography device information, and a determining unit that determines whether or not the inspection target value is within a range of (the expected value)-(the permissible value) and within a range of (the expected value)+(the permissible value), and when the inspection target value is outside the range of (the expected value)-(the permissible value) and outside the range of (the expected value)+(the permissible value), transmits anomaly detection to the key integrated management device. determines whether or not the inspection target value is within a range of (the expected value)-(the permissible value) and within a range of (the expected value)+(the permissible value), and when the inspection target value is outside the range of (the expected value)-(the permissible value) and outside the range of (the expected value)+(the permissible value), transmits anomaly detection to the key integrated management device.