A compressor , comprising: a compressor main body including a cylinder , a piston reciprocating in an axial direction of the cylinder , and a driving unit for driving the piston ; a casing surrounding the compressor main body; a first support supporting a suction side of the compressor main body in the casing ; a second support supporting a discharge side of the compressor main body in the casing ; a terminal transferring external power to the driving unit of the compressor ; a cover installed outside the terminal , and protecting the terminal ; and a discharge pipe discharging a compressed coolant from the compressor , wherein the casing is formed in a cylindrical shape having a major axis formed in the axial direction of the cylinder and a minor axis perpendicular to the major axis, characterized in that the casing includes a lower shell and an upper shell fixed to the lower shell , a separation plane (SP) where the lower shell and the upper shell are fixed is inclined from a horizontal center line (HCL) of the casing as viewed in the minor axis of the casing , wherein a first end of two opposite ends of the separation plane (SP) is positioned under the horizontal center line (HCL) of the casing and a second end of the two opposite ends of the separation plane (SP) is positioned above the horizontal center line (HCL) of the casing as viewed in the minor axis of the casing , wherein the terminal and the cover are installed in the lower shell on the side where the second end of the separation plane (SP) is located, and wherein the discharge pipe passes through the cover and is connected to a discharge space . a compressor main body including a cylinder , a piston reciprocating in an axial direction of the cylinder , and a driving unit for driving the piston ; a casing surrounding the compressor main body; a first support supporting a suction side of the compressor main body in the casing ; a second support supporting a discharge side of the compressor main body in the casing ; a terminal transferring external power to the driving unit of the compressor ; a cover installed outside the terminal , and protecting the terminal ; and a discharge pipe discharging a compressed coolant from the compressor , wherein the casing is formed in a cylindrical shape having a major axis formed in the axial direction of the cylinder and a minor axis perpendicular to the major axis, characterized in that the casing includes a lower shell and an upper shell fixed to the lower shell , a separation plane (SP) where the lower shell and the upper shell are fixed is inclined from a horizontal center line (HCL) of the casing as viewed in the minor axis of the casing , wherein a first end of two opposite ends of the separation plane (SP) is positioned under the horizontal center line (HCL) of the casing and a second end of the two opposite ends of the separation plane (SP) is positioned above the horizontal center line (HCL) of the casing as viewed in the minor axis of the casing , wherein the terminal and the cover are installed in the lower shell on the side where the second end of the separation plane (SP) is located, and wherein the discharge pipe passes through the cover and is connected to a discharge space . <EOS>