A model for measuring stress distribution constituted by a light, integral polyurethane foam having little unevenness in density, the polyurethane foam being at predetermined sites provided with undercoating layers, to each of which a resistance wire strain gauge is attached via an adhesive, each of the undercoating layers having a thickness of 50-300 .mu.m and being made of a material which is unreactive with, hardly penetrable into and softer than the polyurethane foam. The stress distribution measurement is conducted by supporting the polyurethane foam model by one or more support members at positions corresponding to the restraint sites of an actual metal member, and applying a load to the polyurethane foam model at a position corresponding to the site of the actual metal member to which a load is actually applied, thereby measuring a stress distribution in the polyurethane foam model under substantially the same restraint conditions as in the actual metal members.