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.