To provide a structure in which a liquefied gas is measured by a valve and then evaporated in a sufficiently short period of time, in a nail gun including a combustion chamber for igniting a mixture gas of the liquefied gas with air and driving a nail with the liquefied gas.

The nail gun includes: a fuel tank for storing fuel that may be a liquefied gas; the combustion chamber 3 connected to the fuel tank via the valve and including a piston 1 for propelling a nail driving plunger 4; and an ignition device 11 for igniting the mixture gas of the fuel with air in the combustion chamber 3. The nail gun further includes a fuel evaporation device 8 that is electrically operated to be brought into an active state in the fuel transportation areas 6, 7 oriented to the combustion chamber 3.