SEALED COMPRESSOR

A sealed compressor of the present invention comprises an electric component (105); a compression component (107); and a sealed container (101) accommodating the electric component (105) and the compression component (107); wherein the compression component (107) includes: a cylinder block (115) defining a compression chamber (135); a piston (125); and a valve plate (133) having a suction hole (137) through which a refrigerant gas to be compressed in the interior of the compression chamber (135) flows, and a discharge hole (139) through which the refrigerant gas compressed in the interior of the compression chamber 8135) is discharged; wherein the piston (125) is provided with a projection (155) on a tip end surface (153) which faces the valve plate (133); and wherein the projection (155) is configured such that side surfaces thereof include at least one flat surface and a gradient α of the flat surface with respect to the tip end surface of the piston (125) is smaller than a gradient of another side surface of the projection (155) with respect to the tip end surface of the piston (125).