PURPOSE: To provide the production method of a discharge valve not damaging a reed and the valve plate device having the constitution suitable for using the discharge valve obtained by the production method.

CONSTITUTION: The production method is provided with a blanking process to blank a discharge valve preform 1 having connected pieces 5 connect reeds each other, a grinding process to simultaneously grind press cut face of plural discharge valve preforms obtained by the blanking process and a cutting process to cut away a connected pieces 5 from a reed 4 after grinding process. A valve plate device arranges a recessed part 112 at the position corresponding to the final cut part 7 of a valve plate 11, also, arranging notch in the position corresponding to the final cut part 7 of a valve retainer 13.