DRIVING MACHINE

PROBLEM TO BE SOLVED: To provide a driving machine that facilitates fixing in a particular mode of operation, in the driving machine having a plurality of modes of operation.SOLUTION: A pneumatic driving machine has a housing 2, a driving mechanism provided in the housing 2, a turning shaft 251 for attaching a trigger 6 to the housing 2, and a switching shaft 252 rotating integrally with the turning shaft 251 while being eccentric from the center of the turning shaft 251 and switching the trigger 6 between a single-driving mode and a continuous-driving mode according to a rotating position. A fixing knob 61 for fixing the rotating position of the switching shaft 252 is attached to the switching shaft 252. The fixing knob 61 is used for causing a pneumatic nailing machine 1 to be specified in the single-driving mode, and fixed to the housing 2 in a non-rotatable manner.