To provide a manufacturing method of an iron oxyhydroxide for improving the discharge performance of a nonaqueous electrolyte electrochemical cell containing the iron oxyhydroxide, and to provide an inexpensive active material, an electrode and a nonaqueous electrolyte electrochemical cell low in environmental load, and having excellent discharge performance.

In this manufacturing method of the iron oxyhydroxide for a nonaqueous electrolyte electrochemical cell, an iron fluoro complex is reacted with a boric acid in an aqueous solution. In a manufacturing method of an active material for a nonaqueous electrolyte cell, an aqueous solution containing an iron fluoro complex and a boric acid is brought into contact with carbon powder to form the iron oxyhydroxide in the carbon powder. The aqueous solution containing an iron fluoro complex and a boric acid is brought into contact with a collector substrate to form the iron oxyhydroxide on the collector substrate. In addition, this electrode containing iron oxyhydroxide manufactured by the methods is used in the nonaqueous electrolyte electrochemical cell.