PROBLEM TO BE SOLVED: To provide an egg shell membrane powder or the like which has lysyl oxidase activity.SOLUTION: The egg shell membrane powder has lysyl oxidase activity, and the average particle size measured by laser diffraction type particle size distribution measurement is ≤300 μm. In the lysyl oxidase activity, the generation speed of benzaldehyde in the case benzylamine is used as a substrate is preferably ≥0.01 nmol/mg min. The number of viable bacteria included in the egg shell membrane powder is preferably ≤1.0×10cfu/g.