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In accordance with the CAFE program, for lighter-wight of a loudspeaker, the weight and performance of loudspeakers were analyzed, and thereby a lighter-weight loudspeaker has been developed. This loudspeaker consists of a light-weight magnetic circuit with a higher magnetic-flux utilization rate and a high-rigidity light-weight frame. In the first place, this paper describes the weight-contributing-rate of a loudspeaker by analyzing the weight constitution of conventional loudspeakers. In the next place, for the magnetic circuit with the highest weight-contributing-rate, a light weight magnetic circuit structure which enhances the magnetic-utilization-rate of the magnet through the C A E analysis and the axis of easy magnetization of the Nd-Fe-B system magnet with high energy-product are described.