Piston of Internal Combustion Engine

摘要

A piston for an internal combustion engine includes a piston base material including a pair of skirt portions opposed to each other in a radial direction of the piston base material. The piston includes a multiple-layer coating formed on at least one of surfaces of the pair of skirt portions. The piston further includes marks provided to respective layers of the multiple-layer coating at locations different from each other.