a discharging valve device for a compressor discharges gas compressed in a compression chamber outside said chamber against an urging force of a discharging valve to a valve seat and resistance of breaking a film of a lubricating oil deposited at and near a cacting area formed between the valve seat and the discharging valve . the discharging valve device comprises a discharging port communicated with a compression chamber , a valve seat formed at the peripheral portion of said discharging port and having a curvature in cross section , and a discharging valve which is forcibly in contact with a part of said valve seat so as to open and close said discharging port depending on pressure in said compression chamber , wherein a contacting width of the sealing part formed by the contact through an oil film between said discharging valve and said valve seat is smaller than a contacting width of an oil film formed in case of combination of a flat discharging valve with a valve seat having a uniform curvature in cross section .