To exactly form an electrode film on a vibrating reed by stabilizing the vibration frequency output of a monitor quartz crystal.

The monitor quartz crystal 30 and oscillator 27 of the device for forming the electrode film on the vibrating reed in a vacuum chamber 21 are arranged within the same housing implement by shortening the distance from the monitor quartz crystal 30 to the oscillator 27 in order to oscillate the monitor quartz crystal 30 by the oscillator 27 in the vacuum chamber 21 and decrease the floating capacitance between the monitor quartz crystal 30 and the oscillator 27. The attenuation in output signals is made up by arranging an amplifier 50 behind the output signals of the oscillator 27 for oscillation of the monitor quartz crystal.