A reciprocating compressor comprising: a hermetic container; and a compressing element accommodated in the hermetic container and compressing refrigerant gas, the compressing element including: a crankshaft disposed generally in a perpendicular direction and having a main shaft and an eccentric section; a block forming a cylindrical cylinder; a piston reciprocating in the cylinder; and a connecting rod connecting the eccentric section to the piston; wherein the cylinder is disposed offset such that an axis line of the cylinder and an axis line of the main shaft do not cross each other, characterized in that the reciprocating compressor further comprises a balancing weight for balancing vibrations produced by structural parts of the compressing element, wherein the structural parts include the piston and/or the connecting rod and/or the eccentric section, wherein a center of gravity of the balancing weight is placed opposite to a center of the eccentric section with respect to the axis line of the main shaft and deviated along a rotating direction of the main shaft from a line connecting the axis line of the main shaft and the center of the eccentric section, and relative positions of the center of gravity of the balancing weight and the center of the eccentric section with respect to the axis line of the main shaft are maintained during operation of the reciprocating compressor. a hermetic container; and a compressing element accommodated in the hermetic container and compressing refrigerant gas, the compressing element including: a crankshaft disposed generally in a perpendicular direction and having a main shaft and an eccentric section; a block forming a cylindrical cylinder; a piston reciprocating in the cylinder; and a connecting rod connecting the eccentric section to the piston; wherein the cylinder is disposed offset such that an axis line of the cylinder and an axis line of the main shaft do not cross each other, characterized in that the reciprocating compressor further comprises a balancing weight for balancing vibrations produced by structural parts of the compressing element, wherein the structural parts include the piston and/or the connecting rod and/or the eccentric section, wherein a center of gravity of the balancing weight is placed opposite to a center of the eccentric section with respect to the axis line of the main shaft and deviated along a rotating direction of the main shaft from a line connecting the axis line of the main shaft and the center of the eccentric section, and relative positions of the center of gravity of the balancing weight and the center of the eccentric section with respect to the axis line of the main shaft are maintained during operation of the reciprocating compressor. a crankshaft disposed generally in a perpendicular direction and having a main shaft and an eccentric section; a block forming a cylindrical cylinder; a piston reciprocating in the cylinder; and a connecting rod connecting the eccentric section to the piston; wherein the cylinder is disposed offset such that an axis line of the cylinder and an axis line of the main shaft do not cross each other, characterized in that the reciprocating compressor further comprises a balancing weight for balancing vibrations produced by structural parts of the compressing element, wherein the structural parts include the piston and/or the connecting rod and/or the eccentric section, wherein a center of gravity of the balancing weight is placed opposite to a center of the eccentric section with respect to the axis line of the main shaft and deviated along a rotating direction of the main shaft from a line connecting the axis line of the main shaft and the center of the eccentric section, and relative positions of the center of gravity of the balancing weight and the center of the eccentric section with respect to the axis line of the main shaft are maintained during operation of the reciprocating compressor.