The biodiesel derived from animal fats has the problem of high Cold Filter Plugging Point (CFPP, an index of the low temperature property). Therefore, the pyrolysis method has been paid attention to. In this method, the ester bond of triglyceride, the principal ingredient of oils and fats, is cracked by the decarboxylation reaction. As a result, the biodiesel consist of hydrocarbons is produced and its CFPP is lower than that of conventional biodiese. Authors have so far clarified the following two facts. The decarboxylation occurs to triglyceride after it is converted to fatty acid. The Pd-loaded active carbon is effective for the promotion of the decarboxylation of the fatty acid. However, Pd is expensive. Therefore, cheap Ni catalysts were tested in this report. As a result, it was clarified that the Ni-loaded brown coal is effective for the promotion of the decarboxylation of fatty acid.