Disclosed is a reciprocating compressor having a crankshaft coupled to a rotor of a motor unit and configured to transfer a rotational force, a connecting rod coupled to the crankshaft and configured to convert a rotational force of the crankshaft into a linear motion of the piston, and a sleeve interposed between the crankshaft and connecting rod and serving as a bearing, wherein the connecting rod is provided with a connecting portion formed in a ring on one side, the sleeve is interposed in the connecting portion; and an outer diameter of the sleeve is smaller than an inner diameter of the connecting portion of the connecting rod in the room temperature. The sleeve is fabricated with the outer diameter smaller than the inner diameter of the connecting rod to be non-press-fitted, thereby facilitating an assembly of the sleeve, and also the deformation of the inner diameter of the sleeve is prevented during the assembly of the sleeve, thereby preventing beforehand an increase in the input load of the motor unit due to the deformation of the sleeve and the abrasion of a pin of a crankshaft.