A uniflow-scavenged two-cycle engine (100) includes: a cylinder (110) in which a combustion chamber (124) is formed; a piston (112); a scavenging chamber (122) that surrounds one end side of the cylinder in the stroke direction of the piston and to which compressed active gas is guided; a scavenging port (118) that is provided in a portion of the cylinder which is positioned in the scavenging chamber and suctions active gas from the scavenging chamber to the combustion chamber in response to a sliding motion of the piston; a fuel injection opening (126) that is provided on an outer side of the cylinder in a radial direction thereof from the scavenging port and injects fuel gas into the active gas which is suctioned into the scavenging port; and a fuel injecting valve (128) that opens and closes a fuel supply path (144) through which a fuel tank (140), in which the fuel gas is stored, communicates with the fuel injection opening. In addition, the fuel injecting valve is disposed in an isolated space (146) isolated from the scavenging chamber.
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