To provide a method for producing low VOC (volatile organic compound)-diffusion polyurethane foam at a low cost which does not affect moldability of the polyurethane foam produced by reacting at least a polyol and an isocyanate.

This method for producing the low VOC-diffusion polyurethane foam obtained by reacting at least a polyol and an isocyanate comprises applying steam to the polyurethane foam, thereby reducing the VOC diffusion amount of the polyurethane foam.