Fuente: WIPO "milk" It is intended to provide a method for producing a composition containing a sialic acid compound with a significantly high content of a sialic acid compound efficiently and economically from milk, whey, a processed product thereof or the like, which is a natural raw material containing a sialic acid compound. The method for producing a composition containing a sialic acid compound comprising using a liquid raw material containing a sialic acid compound or a liquid obtained by dissolving or suspending a solid raw material containing a sialic acid compound in water as a raw material, culturing, in the raw material, a microorganism which does not have an ability to assimiate a sialic acid compound and has an ability to assimilate a carbohydrate other than a sialic acid compound contained in the raw material, and removing the microorganism after the carbohydrate other than the sialic acid compound contained in the raw material has been assimilated is provided.