A rotary compressor comprising: - a hermetic vertical compressor housing including: -- a discharge unit that discharges refrigerant provided in an upper portion of the housing; and -- a suction unit (104, 105) for the refrigerant is provided in a lower portion of side surface of the housing; - a compressing unit that is arranged in a lower portion of the compressor housing, the compressing unit including: -- an annular cylinder (121S, 121T); -- an end plate (160S, 160T) that includes a bearing portion (161S, 161T) and a discharge valve portion (200S, 200T, 201S, 201T) and closes an end portion of the cylinder (121S, 121T); - an annular piston (125S, 125T) that is fitted to an eccentric portion (152S, 152T) of a rotating shaft supported by the bearing portion (161S, 161T), revolves in the cylinder (121S, 121T) along a cylinder inner-wall (123S, 123T) of the cylinder (121S, 121T), and forms an operating chamber (130S, 130T) between the annular piston (125S, 125T) and the cylinder inner-wall (123S, 123T); and - a vane (127S, 127T) that comes into contact with the annular piston (125S, 125T) by projecting into the operating chamber (130S, 130T) from an inside of a vane groove (128S, 128T) of the cylinder (121S, 121T) and divides the operating chamber (130S, 130T) into a suction chamber (131S, 131T) and a compression chamber (133D, 133T), and that draws a refrigerant through the suction unit (104, 105) and discharges a refrigerant from the discharge unit through an inside of the compressor housing; and - a motor that is arranged in an upper portion of the compressor housing and drives the compressing unit via the rotating shaft; wherein - the end plate (160S, 160T) has a groove portion (163S, 163T) accommodating at a bottom portion thereof the discharge valve portion (200S, 200T, 201S, 201T) that includes a reed valve type discharge valve (200S, 200T) and a discharge-valve limiter (201S, 201T) that are attached to the groove portion (163S, 163T) with a rivet (203S, 203T), - the groove portion (163S, 163T) has a rivet-side enlarged diameter portion (163Sa, 163Ta) which is formed into a semicircular step shape, the rivet-side enlarged diameter portion (163Sa, 163Ta) having a first diameter (Hd) at the bottom portion and having a second diameter (Ha) which is larger than the first diameter (Hd) at a portion where a diameter is enlarged, characterized in that a relationship h m - (t v +0.4t o) ≥ h z ≥ h m - (t v +0.8t o) is satisfied, where h m is a depth down to the bottom of the groove portion (163S, 163T), h z is a depth down to a step portion (163Saa, 163Taa) of the semicircular step, t v is a thickness of the discharge valve (200S, 200T), and t o is a thickness of the discharge-valve limiter (201S, 201T). - a hermetic vertical compressor housing including: -- a discharge unit that discharges refrigerant provided in an upper portion of the housing; and -- a suction unit (104, 105) for the refrigerant is provided in a lower portion of side surface of the housing; -- a discharge unit that discharges refrigerant provided in an upper portion of the housing; and -- a suction unit (104, 105) for the refrigerant is provided in a lower portion of side surface of the housing; - a compressing unit that is arranged in a lower portion of the compressor housing, the compressing unit including: -- an annular cylinder (121S, 121T); -- an end plate (160S, 160T) that includes a bearing portion (161S, 161T) and a discharge valve portion (200S, 200T, 201S, 201T) and closes an end portion of the cylinder (121S, 121T); -- an annular cylinder (121S, 121T); -- an end plate (160S, 160T) that includes a bearing portion (161S, 161T) and a discharge valve portion (200S, 200T, 201S, 201T) and closes an end portion of the cylinder (121S, 121T); - an annular piston (125S, 125T) that is fitted to an eccentric portion (152S, 152T) of a rotating shaft supported by the bearing portion (161S, 161T), revolves in the cylinder (121S, 121T) along a cylinder inner-wall (123S, 123T) of the cylinder (121S, 121T), and forms an operating chamber (130S, 130T) between the annular piston (125S, 125T) and the cylinder inner-wall (123S, 123T); and - a vane (127S, 127T) that comes into contact with the annular piston (125S, 125T) by projecting into the operating chamber (130S, 130T) from an inside of a vane groove (128S, 128T) of the cylinder (121S, 121T) and divides the operating chamber (130S, 130T) into a suction chamber (131S, 131T) and a compression chamber (133D, 133T), and that draws a refrigerant through the suction unit (104, 105) and discharges a refrigerant from the discharge unit through an inside of the compressor housing; and - a motor that is arranged in an upper portion of the compressor housing and drives the compressing unit via the rotating shaft; wherein - the end plate (160S, 160T) has a groove portion (163S, 163T) accommodating at a bottom portion thereof the discharge valve portion (200S, 200T, 201S, 201T) that includes a reed valve type discharge valve (200S, 200T) and a discharge-valve limiter (201S, 201T) that are attached to the groove portion (163S, 163T) with a rivet (203S, 203T), - the groove portion (163S, 163T) has a rivet-side enlarged diameter portion (163Sa, 163Ta) which is formed into a semicircular step shape, the rivet-side enlarged diameter portion (163Sa, 163Ta) having a first diameter (Hd) at the bottom portion and having a second diameter (Ha) which is larger than the first diameter (Hd) at a portion where a diameter is enlarged,