Provided is a negative electrode for a secondary battery satisfying the following Relation 1: V 1 − V 2 / V 1 * 100 ≥ 45 % wherein V 1 is a volume fraction (vol%) of silicon-based active material particles having a gray scale value of 30,000 or more in an XRM measurement on a negative electrode in a fully discharged state after formation, and V 2 is a volume fraction (vol%) of silicon-based active material particles having a gray scale value of 30,000 or more in an XRM measurement on a negative electrode in a fully charged state after 500 cycles of charging and discharging.