To obtain an iron phosphate compound having a catalytic function or the like.

This compound is an iron phosphate-oxalic acid composite compound shown by the general formula FePO4.x(H2O)2.y(COX)2 (X is a hydroxyl, alkoxyl or O-M group; M is an alkaline metal atom or NH4 group; (x) is an integer of 0 to 4; and (y) is an integer of 1 to 4).