Internal combustion engine

An internal combustion engine comprising:

• a piston having a cavity formed in a central portion of a top surface thereof;
• and
• an injector that injects fuel into the cavity, wherein the cavity includes:
• a raised portion having a first inclined surface inclined downward from a radial center of the piston toward an outer side in a radial direction;
• a protrusion provided along a circumferential direction of the piston on an outer side of the raised portion in the radial direction;
• and
• a connecting portion that is provided so as to surround the raised portion and connects the protrusion and the raised portion,
• the connecting portion includes a curved surface continuous with the protrusion, a second inclined surface that is continuous with the curved surface on an inner side in the radial direction and inclined so as to become lower toward an outer side in the radial direction, and a step portion formed between the second inclined surface and the raised portion, and
• an angle of the second inclined surface with respect to an orthogonal plane perpendicular to an axial direction of the piston is greater than an angle of the first inclined surface with respect to the orthogonal plane.