Abstract
Honda has been researching and developing fuel cell to resolve issues we face such as air pollution and energy conservation. In October 2003, Honda announced the original fuel cell stack, and in November 2004 delivered the Honda FCX to New York State. In addition, Honda developed FCX CLARITY that is applied with technology of next generation fuel cell system and the body. And we started to deliver the FCX CLARITY for an individual user as a lease sale in July 2008.Honda could get various knowledge and experience about fuel cell stack by running FCX at the various regions, and it becomes clear about some problems of durability. This paper describes the durability of the FCX fuel cell stack.