1. An oscillator including an oscillator circuit connected to a plurality of crystal resonators, and a plurality of heater circuits for stabilizing a temperature of an atmosphere in which the crystal resonators are placed, the oscillator comprising:a first substrate, supported in a inner most container with a first supporting member from an inner wall of the inner most container;
a temperature detector, configured to detect a temperature inside the innermost container, and the heater circuits is controlled based on a temperature detection value of the temperature detector, and the crystal resonators, the oscillator circuit, the temperature detector and the heater circuits being each disposed on the first substrate and inside the inner most container;
a outer most container, housing the inner most container in an internal space of the outer most container, the outer most container supporting the inner most container from an inner wall of the outer most container via a supporting portion; and
a voltage stabilizer circuit, disposed apart from the inner most container in the outer most container, the voltage stabilizer circuit stabilizing a supply voltage supplied to the heater circuits.