A scroll compressor comprising: a sealed container; a compression mechanism portion provided within the sealed container and having a compression chamber in which plate-like scroll teeth (1b, 2b) of a fixed scroll and an orbiting scroll are meshed with each other to compress a refrigerant; an electric motor provided within the sealed container and configured to rotationally drive the orbiting scroll; a rotary shaft configured to transfer a drive force of the electric motor to the orbiting scroll; a frame configured to rotatably support the rotary shaft; balance weights (15a, 15b) fixed to an upper surface and a lower surface of a rotor of the electric motor and configured to cancel out unbalance of a force generated in the compression mechanism portion; a refrigerant flow path configured to introduce a refrigerant gas discharged from a discharge port provided to the fixed scroll of the compression mechanism portion, to a bottom portion of the sealed container; cup-shaped members (17, 18) respectively provided on the upper surface and the lower surface of the rotor of the electric motor and containing the balance weights (15a, 15b); a penetrating flow path through which the refrigerant gas containing a refrigerating machine oil flows from a lower side of the rotor of the electric motor through interiors of the cup-shaped members (17, 18) to an upper side of the rotor, wherein the penetrating flow path is provided so as to avoid the installation positions of the balance weights (15a, 15b) and extend through bottom portions of the cup-shaped members (17, 18); and a discharge cover provided at a lower portion of the frame, having an opening opposed to an opening of one of the cup-shaped members provided on the upper surface of the rotor of the electric motor, and configured to introduce the refrigerant gas having passed through the penetrating flow path, to a discharge pipe provided to the sealed container. a sealed container; a compression mechanism portion provided within the sealed container and having a compression chamber in which plate-like scroll teeth (1b, 2b) of a fixed scroll and an orbiting scroll are meshed with each other to compress a refrigerant; an electric motor provided within the sealed container and configured to rotationally drive the orbiting scroll; a rotary shaft configured to transfer a drive force of the electric motor to the orbiting scroll; a frame configured to rotatably support the rotary shaft; balance weights (15a, 15b) fixed to an upper surface and a lower surface of a rotor of the electric motor and configured to cancel out unbalance of a force generated in the compression mechanism portion; a refrigerant flow path configured to introduce a refrigerant gas discharged from a discharge port provided to the fixed scroll of the compression mechanism portion, to a bottom portion of the sealed container; cup-shaped members (17, 18) respectively provided on the upper surface and the lower surface of the rotor of the electric motor and containing the balance weights (15a, 15b); a penetrating flow path through which the refrigerant gas containing a refrigerating machine oil flows from a lower side of the rotor of the electric motor through interiors of the cup-shaped members (17, 18) to an upper side of the rotor, wherein the penetrating flow path is provided so as to avoid the installation positions of the balance weights (15a, 15b) and extend through bottom portions of the cup-shaped members (17, 18); and a discharge cover provided at a lower portion of the frame, having an opening opposed to an opening of one of the cup-shaped members provided on the upper surface of the rotor of the electric motor, and configured to introduce the refrigerant gas having passed through the penetrating flow path, to a discharge pipe provided to the sealed container.