400 the temporary supporting member 300 is not deformed at such a temperature that the conductive adhesives 251 and 252 are cured a temperature in the range from 150 u00b0 c to 180 u00b0 c fig2 g illustrates a state in which the temporary supporting member 300 is heated to be deformed at a temperature of 300 u00b0 c in the electric furnace after the curing of the conductive adhesives 251 and 252 the temporary supporting member 300 enters the hollow portion 221 to be cured fig2 h illustrates a state in which the lid 500 is placed on the package 200 and the piezoelectric oscillator 100 is glass sealed the temporary supporting member 300 partially enters the hollow portion 221 to be fixed and therefore the temporary supporting member 300 does not move about inside the package 200 fig3 illustrates the piezoelectric oscillator 100 before the attachment of the lid 500 one end of the piezoelectric vibrator 400 is supported by the conductive adhesives 251 and 252 applied respectively to the metal pads 230 and 240 provided on the step 210 the temporary supporting member 300 which has been thermally deformed is found on the floor surface 215 of the package 200 below the free end of the piezoelectric vibrator 400 as discussed above the temporary supporting member 300 partially enters the hollow portion 221 formed under the floor surface 215 to be fixed.