A gas injection valve comprising: a gas flow path component that comprises a gas supply path along which fuel gas is supplied, and a gas injection path that is able to feed fuel gas to an interior portion of a cylinder of a gas engine, and also an aperture (3 a) that located between these paths and is able to communicate with both paths; a valve body that opens and closes the aperture; and a valve driving apparatus (36, 62) that, when fuel injection is halted, causes the valve body to approach the gas path component such that a distal end portion of the valve body closes off the aperture, and that, when fuel is being injected, causes the valve body to retire from the gas path component such that the distal end portion of the valve body opens up the aperture, wherein the valve driving apparatus comprises: an apparatus body (42, 66) that supports the valve body such that it is able to move in both a direction in which it approaches the gas path component and a direction in which it retreats from the gas path component; a spring bearing (45, 69) that is attached to the valve body; a piston (43, 67) that is housed in the apparatus body (42, 66) such that it is able to move in the same direction as the valve body, and to which fluid pressure is applied in a direction moving away from the gas path component; characterized in that it further comprises: a first spring (49, 73) that urges the spring bearing (45, 69) in a direction approaching the gas path component; and a second spring (50, 74) that is disposed between the piston (43, 67) and the spring bearing (45, 69), and that is able to expand and contract in the direction of movement of the valve body; wherein the spring bearing (45,69) is disposed between the first spring (49, 73) and the second spring (50, 74); and the arrangement is such that when the spring bearing (45, 69) is raised, a force acts in the compression direction of the first spring (49, 73) so that the spring bearing (45, 69) and the valve body become supported by both the first spring (49, 73) and the second spring (50, 74). a gas flow path component that comprises a gas supply path along which fuel gas is supplied, and a gas injection path that is able to feed fuel gas to an interior portion of a cylinder of a gas engine, and also an aperture (3 a) that located between these paths and is able to communicate with both paths; a valve body that opens and closes the aperture; and a valve driving apparatus (36, 62) that, when fuel injection is halted, causes the valve body to approach the gas path component such that a distal end portion of the valve body closes off the aperture, and that, when fuel is being injected, causes the valve body to retire from the gas path component such that the distal end portion of the valve body opens up the aperture, wherein an apparatus body (42, 66) that supports the valve body such that it is able to move in both a direction in which it approaches the gas path component and a direction in which it retreats from the gas path component; a spring bearing (45, 69) that is attached to the valve body; a piston (43, 67) that is housed in the apparatus body (42, 66) such that it is able to move in the same direction as the valve body, and to which fluid pressure is applied in a direction moving away from the gas path component; a first spring (49, 73) that urges the spring bearing (45, 69) in a direction approaching the gas path component; and a second spring (50, 74) that is disposed between the piston (43, 67) and the spring bearing (45, 69), and that is able to expand and contract in the direction of movement of the valve body;