To provide a device, a system, and a method for detecting failures of a gas sensor that can be used for gas leakage inspections for various cases.SOLUTION: The device for detecting failures of a gas sensor includes: a gas blowoff unit 22 for detecting a gas filled in a tire 101 at the outside of the tire 101 and blowing off the gas to the detection range of the gas sensor in a gas leakage inspection device detecting a gas leakage of the tire 101; and a position fixing unit 21 for fixing the gas blowoff unit 22 in the assumed gas leakage position of the tire 101.SELECTED DRAWING: Figure 3
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