The method of manufacturing to improve the yield of 1,2; 4,5-inositol derivatives by a simple method is disclosed. The method involves introducing and/or removing a cyclic protecting group in a reaction with a catalyst to produce the inositol derivative represented by formula (2) from the inositol derivative represented by formula (1), and advancing the reaction of introducing and/or removing the cyclic protecting group while crystallizing the 1,2; 4,5-inositol derivative represented by formula (2). This is a manufacturing method for inositol derivatives.