A linear compressor comprising: a cylinder that defines a compression chamber configured to accommodate refrigerant, the cylinder comprising a cylinder nozzle configured to receive refrigerant; and a piston provided in the cylinder and configured to be pressed by refrigerant in the cylinder, the piston comprising: a piston body configured to move forward and backward within the cylinder, a piston front part located on a front surface of the piston body, the piston front part comprising a suction port through which refrigerant is supplied into the compression chamber, a suction valve provided at a front side of the piston front part and configured to open and close the suction port, the suction valve having a valve coupling hole, a valve coupling member configured to couple the suction valve to a coupling hole of the piston, and a refrigerant collection part that is recessed from an outer circumferential surface of the piston front part, that extends to a front surface of the piston front part, and that is configured to receive at least a portion of refrigerant compressed in the compression chamber, characterised in that the refrigerant collection part comprises: a discharge part provided at a front surface of the piston front part and configured to be opened and closed by the suction valve; and an inflow part that is provided at the outer circumferenctial surface of the piston front part and that communicates with a gap part between an outer circumferential surface of the piston body and an inner circumferential surface of the cylinder. a cylinder that defines a compression chamber configured to accommodate refrigerant, the cylinder comprising a cylinder nozzle configured to receive refrigerant; and a piston provided in the cylinder and configured to be pressed by refrigerant in the cylinder, the piston comprising: a piston body configured to move forward and backward within the cylinder, a piston front part located on a front surface of the piston body, the piston front part comprising a suction port through which refrigerant is supplied into the compression chamber, a suction valve provided at a front side of the piston front part and configured to open and close the suction port, the suction valve having a valve coupling hole, a valve coupling member configured to couple the suction valve to a coupling hole of the piston, and a refrigerant collection part that is recessed from an outer circumferential surface of the piston front part, that extends to a front surface of the piston front part, and that is configured to receive at least a portion of refrigerant compressed in the compression chamber, characterised in that the refrigerant collection part comprises: a discharge part provided at a front surface of the piston front part and configured to be opened and closed by the suction valve; and an inflow part that is provided at the outer circumferenctial surface of the piston front part and that communicates with a gap part between an outer circumferential surface of the piston body and an inner circumferential surface of the cylinder. a piston body configured to move forward and backward within the cylinder, a piston front part located on a front surface of the piston body, the piston front part comprising a suction port through which refrigerant is supplied into the compression chamber, a suction valve provided at a front side of the piston front part and configured to open and close the suction port, the suction valve having a valve coupling hole, a valve coupling member configured to couple the suction valve to a coupling hole of the piston, and a refrigerant collection part that is recessed from an outer circumferential surface of the piston front part, that extends to a front surface of the piston front part, and that is configured to receive at least a portion of refrigerant compressed in the compression chamber, characterised in that the refrigerant collection part comprises: a discharge part provided at a front surface of the piston front part and configured to be opened and closed by the suction valve; and an inflow part that is provided at the outer circumferenctial surface of the piston front part and that communicates with a gap part between an outer circumferential surface of the piston body and an inner circumferential surface of the cylinder. a discharge part provided at a front surface of the piston front part and configured to be opened and closed by the suction valve; and an inflow part that is provided at the outer circumferenctial surface of the piston front part and that communicates with a gap part between an outer circumferential surface of the piston body and an inner circumferential surface of the cylinder.