To obtain a quartz vibrator or a quartz oscillator of further stabilized frequency by making its temperature constant by flowing a temperature-controlled liquid medium through a flow path of its substrate.

The quartz oscillator is provided with the flow path 5 in at least its substrate 1, its receptacle and the like for flowing the liquid medium, circulating and temperature controlling it in order to make the temperature of the quartz vibrator 2 constant. In this way, its frequency can be stabilized.