PROBLEM TO BE SOLVED: To provide a piston for an internal combustion engine that can suppress deterioration in thermal efficiency even when a piston is cooled.;SOLUTION: A piston 1 for an internal combustion engine includes: a vacuum chamber 20 formed inside of a piston head 10; a hole 30 formed from at least one of a top surface and an undersurface of the piston head 10 in a direction of a piston axis A to the vacuum chamber 20; and a plug part 40 press-fitted into the hole 30 to encapsulate the hole 30.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2019,JPO&INPIT
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