A rotor of a compressor includes a stack having a plurality of symmetrical flux barriers and gaseous refrigerant passages formed at sides of the flux barriers, a pair of end covers mounted on the upper and lower sides of the stack, and an oil scattering prevention device installed in the gaseous refrigerant passages and having prevention plates for preventing oil, passing through the gaseous passages, from entering gaps of the stack and from leaking out of the stack the stack due to the centrifugal force.