Provided is a microorganism that is able to efficiently produce protocatechuic acid or a salt thereof by using a saccharide as a raw material, and a method of efficiently producing protocatechuic acid or a salt thereof by using the microorganism. Provided is a transformant having protocatechuic acid producing ability, subjected to modifications of enhancement of 3-dehydroshikimate dehydratase activity; enhancement of chorismate pyruvate lyase activity; and enhancement of 4-hydroxybenzoate hydroxylase activity. Also provided is a method of producing protocatechuic acid or a salt thereof, including the step of culturing the transformant in a reaction solution containing a saccharide so as to cause the transformant to produce protocatechuic acid or a salt thereof.

Provided is a microorganism that is able to efficiently produce protocatechuic acid or a salt thereof by using a saccharide as a raw material, and a method of efficiently producing protocatechuic acid or a salt thereof by using the microorganism.

Provided is a transformant having protocatechuic acid producing ability, subjected to modifications (A), (B), and (C) below: (A) enhancement of 3-dehydroshikimate dehydratase activity; (B) enhancement of chorismate pyruvate lyase activity; and (C) enhancement of 4-hydroxybenzoate hydroxylase activity.

Also provided is a method of producing protocatechuic acid or a salt thereof, including the step of culturing the transformant in a reaction solution containing a saccharide so as to cause the transformant to produce protocatechuic acid or a salt thereof.