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 draws in an active gas into the combustion chamber in accordance with a sliding movement of the piston ; and a plurality of fuel injection valves 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, wherein the fuel injection valves are provided with a plurality of openings provided in a manner spaced from each other with a predetermined distance in a circumferential direction in the inner circumferential surface of the cylinder between the exhaust port and the scavenging port , and the fuel injection valves at least comprise: a first fuel injection valve configured to inject a fuel gas in a direction along a swirling flow of the active gas drawn in into the cylinder , wherein the fuel gas from the first injection valve is injected toward horizontal direction; characterized in that the fuel injection valves further comprise at least a second fuel injection valve configured to inject a fuel gas toward a direction closer to a central axis of the cylinder than the direction of the fuel gas from the first fuel injection valve , wherein the fuel gas from the second fuel injection valve is injected in a direction vertically upper than the horizontal direction. 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 draws in an active gas into the combustion chamber in accordance with a sliding movement of the piston ; and a plurality of fuel injection valves 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, wherein the fuel injection valves are provided with a plurality of openings provided in a manner spaced from each other with a predetermined distance in a circumferential direction in the inner circumferential surface of the cylinder between the exhaust port and the scavenging port , and the fuel injection valves at least comprise: a first fuel injection valve configured to inject a fuel gas in a direction along a swirling flow of the active gas drawn in into the cylinder , wherein the fuel gas from the first injection valve is injected toward horizontal direction; characterized in that the fuel injection valves further comprise at least a second fuel injection valve configured to inject a fuel gas toward a direction closer to a central axis of the cylinder than the direction of the fuel gas from the first fuel injection valve , wherein the fuel gas from the second fuel injection valve is injected in a direction vertically upper than the horizontal direction. <EOS>