An outboard motor comprising: an internal combustion engine; a cowling in which the internal combustion engine is housed; and a propulsion unit configured to convert a rotational drive force of the internal combustion engine into a thrust force; wherein the internal combustion engine includes: a cylinder head including an intake opening through which intake air is introduced into a combustion chamber of a cylinder and an exhaust opening through which exhaust gas is discharged from the combustion chamber; a plurality of valves (24, 25) configured to open and close the intake opening and the exhaust opening; a pair of valve actuators provided in correspondence to the cylinder head, each including a camshaft, and configured to transmit a drive force to the plurality of valves (24, 25); characterized in that the outboard motor comprises further: a fuel injector including a fuel injection portion configured to inject fuel from a central region of the combustion chamber between the intake opening and the exhaust opening into the combustion chamber, the fuel injector mounted in the cylinder head; and a spark plug including an ignition portion located to be offset in the direction of the camshaft with respect to the fuel injection portion in said central region and configured to provide ignition within the combustion chamber, the spark plug mounted in the cylinder head. an internal combustion engine; a cowling in which the internal combustion engine is housed; and a propulsion unit configured to convert a rotational drive force of the internal combustion engine into a thrust force; wherein the internal combustion engine includes: a cylinder head including an intake opening through which intake air is introduced into a combustion chamber of a cylinder and an exhaust opening through which exhaust gas is discharged from the combustion chamber; a plurality of valves (24, 25) configured to open and close the intake opening and the exhaust opening; a pair of valve actuators provided in correspondence to the cylinder head, each including a camshaft, and configured to transmit a drive force to the plurality of valves (24, 25); characterized in that the outboard motor comprises further: a fuel injector including a fuel injection portion configured to inject fuel from a central region of the combustion chamber between the intake opening and the exhaust opening into the combustion chamber, the fuel injector mounted in the cylinder head; and a spark plug including an ignition portion located to be offset in the direction of the camshaft with respect to the fuel injection portion in said central region and configured to provide ignition within the combustion chamber, the spark plug mounted in the cylinder head. a cylinder head including an intake opening through which intake air is introduced into a combustion chamber of a cylinder and an exhaust opening through which exhaust gas is discharged from the combustion chamber; a plurality of valves (24, 25) configured to open and close the intake opening and the exhaust opening; a pair of valve actuators provided in correspondence to the cylinder head, each including a camshaft, and configured to transmit a drive force to the plurality of valves (24, 25); characterized in that the outboard motor comprises further: a fuel injector including a fuel injection portion configured to inject fuel from a central region of the combustion chamber between the intake opening and the exhaust opening into the combustion chamber, the fuel injector mounted in the cylinder head; and a spark plug including an ignition portion located to be offset in the direction of the camshaft with respect to the fuel injection portion in said central region and configured to provide ignition within the combustion chamber, the spark plug mounted in the cylinder head. a fuel injector including a fuel injection portion configured to inject fuel from a central region of the combustion chamber between the intake opening and the exhaust opening into the combustion chamber, the fuel injector mounted in the cylinder head; and a spark plug including an ignition portion located to be offset in the direction of the camshaft with respect to the fuel injection portion in said central region and configured to provide ignition within the combustion chamber, the spark plug mounted in the cylinder head.