A uniflow-scavenging-type two-cycle engine, comprising: a cylinder in which a combustion chamber is formed; a piston that slides in the cylinder; an exhaust port that is provided at a first end of the cylinder in a stroke direction of the piston; an exhaust valve that opens and closes the exhaust port; a scavenging port that is provided in an inner circumferential surface of a second end of the cylinder in the stroke direction of the piston and inhales an active gas into the combustion chamber in accordance with a sliding movement of the piston; a plurality of fuel injection valves (114, 128) that inject a fuel gas to the active gas, which has been drawn in from the scavenging port to the combustion chamber, to thereby generate a premixed gas; and a fuel injection control unit, characterized in that the fuel injection control unit varies injection directions of fuel gas injected from a part or all of the fuel injection valves (114, 128); the engine further comprises a load determination unit that determines whether the uniflow-scavenging-type two-cycle engine is in a high-load state or in a low-load state, and wherein if a load state detected by the load determination unit is the high-load state, then the fuel injection control unit turns the injection directions of the fuel gas to first directions, which are directions along a swirl flow of the active gas drawn in into the cylinder; and if a load state detected by the load determination unit is the low-load state, then the fuel injection control unit turns the injection directions of the fuel gas to second directions, which are directions closer to a central axis of the cylinder than the first directions. a cylinder in which a combustion chamber is formed; a piston that slides in the cylinder; an exhaust port that is provided at a first end of the cylinder in a stroke direction of the piston; an exhaust valve that opens and closes the exhaust port; a scavenging port that is provided in an inner circumferential surface of a second end of the cylinder in the stroke direction of the piston and inhales an active gas into the combustion chamber in accordance with a sliding movement of the piston; a plurality of fuel injection valves (114, 128) that inject a fuel gas to the active gas, which has been drawn in from the scavenging port to the combustion chamber, to thereby generate a premixed gas; and a fuel injection control unit, characterized in that the fuel injection control unit varies injection directions of fuel gas injected from a part or all of the fuel injection valves (114, 128); the engine further comprises a load determination unit that determines whether the uniflow-scavenging-type two-cycle engine is in a high-load state or in a low-load state, and wherein if a load state detected by the load determination unit is the high-load state, then the fuel injection control unit turns the injection directions of the fuel gas to first directions, which are directions along a swirl flow of the active gas drawn in into the cylinder; and if a load state detected by the load determination unit is the low-load state, then the fuel injection control unit turns the injection directions of the fuel gas to second directions, which are directions closer to a central axis of the cylinder than the first directions.