PROBLEM TO BE SOLVED: To provide a piezoelectric oscillator with a thermostatic chamber, capable of highly accurately controlling the frequency of a piezoelectric vibration element by shortening a time for heat to move from an atmosphere in which the piezoelectric vibration element exists to a lead part, and also capable of suppressing power consumption of a heater part.SOLUTION: This piezoelectric oscillator with the thermostatic chamber at least includes a bottom plate member 110, a printed circuit board part 120 provided with a space kept from the bottom plate member 110 by a connection pin 160, a piezoelectric vibrator 130 mounted on the printed circuit board part 120, a heater part 140 for heating the piezoelectric vibrator 130, a plurality of electronic component elements 150 forming an electronic circuit electrically connected to the piezoelectric vibrator 130 for controlling the temperatures of the heater part while forming an oscillation circuit, and a lid member 170 covering the printed circuit boar
