An object of the present invention is to provide a salt of pyrroloquinoline quinone having a high solubility in water and in an organic solvent and a method for producing the same. According to the present invention, there are provided an ammonium salt of pyrroloquinoline quinone having a high solubility in water and in an organic solvent, consisting of a pyrroloquinoline quinone ion and an ammonium salt having a hydroxyl group.