A reciprocating compressor is provided with a compression section which compresses gas, and a crank section which has a crankshaft and drives the compression section. The compression section is provided with a wall body portion which includes a cylinder and constitutes a wall body of the compression section, a cylinder head attached to the cylinder, a piston which reciprocates within the cylinder, a piston rod which couples the crankshaft and the piston, and at least one sealing member fixed to the wall body portion and disposed in the circumference of the piston rod. The wall body portion has a first boundary wall which forms the boundary with the crank section in the crank section side with respect to the at least one sealing member and acts as a division surface when the crank section and the compression section are separated.