A household food waste disposer is attracting attention as one of the leading disposal systems in Japan, and the possibility that a disposer will be installed at many condominiums from now on is under consideration. Sound and vibration, which are generated by a disposer, are being considered as a new noise source problem. To popularize the disposer in Japan, the reduction of the sound and vibration generated by the disposer is an important matter. In this paper, as a standard method for measurement and evaluation of sound generated by the disposer, the determination of sound power level of a disposer by a comparison method in a hard-walled test room is studied. As a result, the accuracy of measurement for the sound power level of the disposer is practically confirmed. Also it is clear that the sound power level of the disposer is influenced by the kinds of food waste, but frequency characteristics are scarcely affected.