Internal combustion engine

An internal combustion engine comprising a piston in which an anodic oxide film is formed on at least one part of a top face that faces a cylinder head, and an injection valve that is capable of injecting a fuel towards the top face, wherein:

• the top face includes:
• a cavity face which comprises a cavity for causing fuel that is injected to ignite, a squish face which comprises an outer circumference of the top face at an outer side of the cavity face, and a tapered face which is formed between the squish face and the cavity face;
• a rough surface region in which the anodic oxide film is formed is provided over an entire area of the squish face;
• and
• the rough surface region and a smooth surface region in which a surface roughness is less than on the squish face that is provided by formation or non-formation of the anodic oxide film is provided in a region that includes the cavity face and the tapered face, wherein the smooth surface region is provided at least in a region in which a flame caused by fuel from the injection valve contacts at an initial formation stage, and the rough surface region is provided in a region in which the smooth surface region is not provided.