It is an object of the invention to provide an improvement of the operability in a driving operation using a power tool. A representative power tool may comprise a driving material driven into a workpiece, a driving mechanism to drive the driving material into the workpiece, a motor, an operating device that controls energization and de-energization of the motor including a trigger switch and an internal switch, wherein the operating device further comprising a first mode in which, when the trigger switch is depressed, the internal switch is interlocked with the depressing operation of the trigger switch to be turned to the on-position and held in the on-position, while the trigger switch is returned to the off-position when the trigger switch is released and a second mode in which, when the depressing operation of the trigger switch is continued, the trigger switch is held in the on-position, and the internal switch is released from interlock with the trigger switch and is held in the on-position for a predetermined period of time in the working stroke and then returned to the off-position, while the trigger switch is returned to the off-position when the trigger switch is released.