rotator 11 rotatively supported inside the stator 12 and a rotation shaft 13 is inserted into the rotator 11 in a pressed manner as a power is applied to the stator 12 the rotator 11 is rotated by an electromagnetic force and the rotation shaft 13 integrally formed by being pressedly inserted into the rotator 11 delivers the rotation force to the compression part 20 the compression part 20 includes an eccentric part 21 formed at one side of a lower portion of the rotation shaft 13 a roller 22 insertedly installed at an outer side of the eccentric part 21 and a cylinder 25 provided to form a compression chamber 26 at which the roller 22 is accommodated in addition the compression part 20 may include an upper portion bearing 23 and a lower portion bearing 24 to seal the compression chamber 26 coupled to an upper portion and a lower portion of the cylinder 25 respectively and provided to support the rotation shaft 13 one side of the cylinder 25 is provided with a first suction port 3 connected to an inside the first case 1 and the other side of the cylinder 25 is provided with a discharging port not shown to guide the refrigerant gas compressed at the compression chamber 26 to outside the compression chamber 26 one side of the upper bearing 23 is provided with a discharging hole 27 communicating with the discharging port not shown such that the refrigerant gas guided to the discharging.