[Problem] To impart significantly improved myo-inositol producing capability, suitable for use in recombinant DNA techniques and synthetic biology methods, to a host microorganism that does not possess an endogenous myo-inositol biosynthesis pathway, such as Escherichia coli. [Solution] Inositol monophosphatase activity is strengthened in a transformant obtained by introducing a myo-inositol biosynthesis pathway into a host microorganism that does not possess an endogenous myo-inositol biosynthesis pathway
