To provide a discrete type crystal oscillator coping with miniaturization and low cost, and a general-purpose surface mounted crystal resonator suitable for the discrete type crystal oscillator.

Circuit elements 54 forming an oscillation circuit and a temperature compensating circuit are mounted on the upper surface of a planar wiring board 31 provided with external electrodes 35 on its lower surface, spherical conductors 53 are electrically conducted and fixed to mount pads 34 provided on the upper surface of the wiring board, and a second conductive pattern provided in a surface mounted electronic device 10 is electrically conducted and fixed to the conductors 53 and the board 31 has an area wider than that of an outer shape of the device 10.