In this study, the kinetics of the thermal decomposition of aminoguanidinium 5,5'-azobis-1H-tetrazolate (AGAT), which is one of the promising fuel candidates of the new gas generating agents for airbags, was investigated. The kinetic model that fits the main decomposition of AGAT was examined, and the activation energy was obtained. The main decomposition of AGAT was a single elementary process according to the result of mass spectrometry. The recommended kinetic model for the main decomposition of AGAT is Avrami-Erofeev equation (n = 4). The activation energies for the main decomposition obtained under helium by non-isothermal analysis and isothermal analysis were 207 and 209 U mol(-1), respectively.