To provide an oscillator which can be reduced in cost by constituting the crystal oscillator in such a way that the rate adjusting work of the resonator can be finished by one time and a stable time standard can be obtained even at the time when the resonator is used under the atmospheric pressure and a method for manufacturing the oscillator, electronic equipment, and an electronic timepiece.

After a crystal resonator 20 is manufactured, the resonator 20 is not sealed in vacuum, but mounted on a circuit board 4 together with a semiconductor device 30. Then the output of the semiconductor device 30 is inspected by operating the resonator 20 and device 30 on the board 4. Based on the results of the inspection, the rate of the resonator is adjusted by trimming the resonator 20 with a laser beam by partially heating and vaporizing gold partially formed on the surface of the resonator 20 by irradiating the surface of the resonator 20 with the laser beam. After the rate is adjusted, the circuit board 4 is housed in a casing 5 under the atmospheric pressure and the casing 5 is sealed.