Direct injection-type internal combustion engine

An in-cylinder injection type internal combustion engine comprising:

• a cylinder formed by a cylinder block;
• a cylinder head covering one end of the cylinder;
• a piston having a top surface facing the cylinder head and configured to reciprocate in the cylinder;
• an ignition plug disposed in a central portion of the cylinder head in a combustion chamber formed between the cylinder, the cylinder head, and the piston;
• a fuel injection nozzle disposed in the combustion chamber;
• and
• an intake port and an exhaust port provided in the cylinder head with the ignition plug sandwiched therebetween, wherein
• the fuel injection nozzle is disposed on one side in an intake and exhaust direction connecting the intake port to the exhaust port, and is configured to inject fuel toward the ignition plug,
• an inclined surface extending along the intake and exhaust direction and inclined toward a cylinder head as going to the one side, and a pair of side guide portions disposed to sandwich the inclined surface in a crankshaft direction orthogonal to the intake and exhaust direction and a cylinder axial direction that is a reciprocating direction of the cylinder, are formed on the top surface of the piston,
• a width of the inclined surface in the crankshaft direction is formed to be narrowed toward the one side by inner sides of the side guide portions being inclined in the crankshaft direction so as to approach each other toward the one side, and
• a top portion of an end portion of the inclined surface on the one side extends in the crankshaft direction.