A cylinder management system that is configured to manage multiple gas cylinders that supply a cylinder gas to multiple gas analysis devices that analyze an exhaust gas of a specimen as being a vehicle or a part of the vehicle, comprising multiple pressure sensors each of which is configured to detect a pressure of each of the multiple gas cylinders, and a management device that is configured to calculate a cylinder gas residual quantity in each of the gas cylinders based on the pressure detected by each of the pressure sensors, to compare the cylinder gas residual quantity in each of the gas cylinders with a gas consumption quantity assumed to be used for each gas type by the multiple gas analysis devices and to manage a timing to replace each of the gas cylinders, wherein the management device is configured to accumulate the gas consumption quantity assumed to be used for each gas type by the multiple gas analysis devices, and to compare the accumulated gas consumption quantity with the cylinder gas residual quantity in each of the gas cylinders, characterized in that: the management device is further configured to obtain a test schedule for each of the multiple gas analysis devices from each of multiple control units that control the gas analysis devices and to calculate the gas consumption quantity (U 1) assumed to be used by the multiple gas analysis devices for each gas type based on these test schedules, the test schedule contains an exhaust gas certification test that corresponds to an enactment in each country, and contain at least one of a cold start test, a transient test, a hot start test, a running gloss transpiration gas test, a hot soak transpiration gas test and a diurnal transpiration gas test, the management device is configured to use a total value (U 1 +U 2) of the gas consumption quantity based on the test schedule (U 1) and the gas consumption quantity used aside from the test schedule (U 2) as the gas consumption quantity assumed to be used by the multiple gas analysis devices for each gas type, and the management device is configured to use the gas consumption quantity during a maintenance conducted at a predetermined cycle set for each of the multiple gas analysis devices as the gas consumption quantity used aside from the test schedule (U 2). multiple pressure sensors each of which is configured to detect a pressure of each of the multiple gas cylinders, and a management device that is configured to calculate a cylinder gas residual quantity in each of the gas cylinders based on the pressure detected by each of the pressure sensors, to compare the cylinder gas residual quantity in each of the gas cylinders with a gas consumption quantity assumed to be used for each gas type by the multiple gas analysis devices and to manage a timing to replace each of the gas cylinders, wherein the management device is configured to accumulate the gas consumption quantity assumed to be used for each gas type by the multiple gas analysis devices, and to compare the accumulated gas consumption quantity with the cylinder gas residual quantity in each of the gas cylinders, characterized in that: the management device is further configured to obtain a test schedule for each of the multiple gas analysis devices from each of multiple control units that control the gas analysis devices and to calculate the gas consumption quantity (U 1) assumed to be used by the multiple gas analysis devices for each gas type based on these test schedules, the test schedule contains an exhaust gas certification test that corresponds to an enactment in each country, and contain at least one of a cold start test, a transient test, a hot start test, a running gloss transpiration gas test, a hot soak transpiration gas test and a diurnal transpiration gas test, the management device is configured to use a total value (U 1 +U 2) of the gas consumption quantity based on the test schedule (U 1) and the gas consumption quantity used aside from the test schedule (U 2) as the gas consumption quantity assumed to be used by the multiple gas analysis devices for each gas type, and the management device is configured to use the gas consumption quantity during a maintenance conducted at a predetermined cycle set for each of the multiple gas analysis devices as the gas consumption quantity used aside from the test schedule (U 2). the management device is further configured to obtain a test schedule for each of the multiple gas analysis devices from each of multiple control units that control the gas analysis devices and to calculate the gas consumption quantity (U 1) assumed to be used by the multiple gas analysis devices for each gas type based on these test schedules, the test schedule contains an exhaust gas certification test that corresponds to an enactment in each country, and contain at least one of a cold start test, a transient test, a hot start test, a running gloss transpiration gas test, a hot soak transpiration gas test and a diurnal transpiration gas test, the management device is configured to use a total value (U 1 +U 2) of the gas consumption quantity based on the test schedule (U 1) and the gas consumption quantity used aside from the test schedule (U 2) as the gas consumption quantity assumed to be used by the multiple gas analysis devices for each gas type, and the management device is configured to use the gas consumption quantity during a maintenance conducted at a predetermined cycle set for each of the multiple gas analysis devices as the gas consumption quantity used aside from the test schedule (U 2).