PURPOSE: To provide an air drive type oscillation pen designed to deeply hit into the work by furnishing a lever type power cylinder mechanism that acts to increase the output of the oscillator and transmit it to the stylus in an oscillation pen to oscillate through a compressed air as a driving source.

CONSTITUTION: Levers 4A, 4B that are supported by a support pin 3 and operate to transfer the output of the piston 2A to the stylus 5 are provided between the piston 2A for transferring the output of the oscillator 2 and the stylus 5 to hit the work. The head 5A of the stylus 5 is situated between the support pin 3 and a contact point of the piston 2A. The spring 6 operates to push the levers 4A, 4B against the piston 2A and follows to the movement of the piston 2A, and the lever 4A, 4B increase the force of the piston 2A through the principle of a lever and transfer it to the stylus 5.