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Fuel without carbon is essential effective in preventing global warming by carbon dioxide. Hydrogen has no carbon and can be made also from the resources such as nuclear energy or renewable energies. However hydrogen is lack of portability for automobiles because of its difficulty in liquefying. Ammonia also has an advantage in terms of global warming because of carbon-free fuel. A hydrogen generation system fueled with ammonia from urea for a fuel-cell electric vehicle is described in this paper. In ammonia, the handling must be careful of safety specifically because toxicity of ammonia affects a human body and a fuel cell. On the other hand, urea can be easily changed into ammonia and dealt with safety. The license for handling of urea is unnecessary, and there are also achievements as a NOx reducing agent for diesel engines. The authors have proposed urea as a hydrogen carrier via ammonia.