A decomposed gas sensor for gas-insulated apparatuses responds to a decomposed gas of an insulating gas with high sensitivity and at high speed and is easily produced at low cost. An insulating gas decomposition detector for detecting decomposition and a decomposed gas detecting method are also disclosed. A decomposed gas sensor (1) for gas-insulated apparatuses for detecting a decomposed gas of the insulating gas sealed in a high-voltage electric apparatus. The decomposed gas sensor (1) is characterized mainly in that it comprises a detecting unit made of a semiconductor carbon nano material (2), and when a decomposed gas is adsorbed on the semiconductor carbon nano material (2) and reacts, the detection unit outputs an impedance variation.
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