A linear compressor comprising: a shell in which a refrigerant suction part is disposed; a cylinder provided inside the shell; a piston configured for reciprocating inside the cylinder; a motor assembly for providing a driving force for movement of the piston; and a magnet assembly for delivering the driving force exerted by the motor assembly to the piston, wherein the magnet assembly comprises: a magnet frame having a cylinder shape; a permanent magnet installed at the magnet frame, being made of a ferrite-based material; a coupling plate coupled to one side of the magnet frame; and a fixing member coupled to the permanent magnet and the coupling plate, characterized in that the coupling plate comprises: a piston coupling part coupled to the piston; a side extension part extending from the piston coupling part and laid on an outer circumference of the magnet frame; and a flange part extending in an outer radial direction of the magnet frame from the side extension part and having a contact part coupled to an end portion of the permanent magnet, wherein the permanent magnet comprises: a first surface coupled to an outer circumference of the magnet frame; and a second surface disposed in a direction opposite to the first surface, wherein a surface connecting an end portion of the flange part and the second surface of the permanent magnet is provided on an inner surface of the fixing member, wherein the fixing member is made of a mixture of a glass fiber or a carbon fiber, and a resin. a shell in which a refrigerant suction part is disposed; a cylinder provided inside the shell; a piston configured for reciprocating inside the cylinder; a motor assembly for providing a driving force for movement of the piston; and a magnet assembly for delivering the driving force exerted by the motor assembly to the piston, wherein the magnet assembly comprises: a magnet frame having a cylinder shape; a permanent magnet installed at the magnet frame, being made of a ferrite-based material; a coupling plate coupled to one side of the magnet frame; and a fixing member coupled to the permanent magnet and the coupling plate, characterized in that the coupling plate comprises: a piston coupling part coupled to the piston; a side extension part extending from the piston coupling part and laid on an outer circumference of the magnet frame; and a flange part extending in an outer radial direction of the magnet frame from the side extension part and having a contact part coupled to an end portion of the permanent magnet, wherein the permanent magnet comprises: a first surface coupled to an outer circumference of the magnet frame; and a second surface disposed in a direction opposite to the first surface, wherein a surface connecting an end portion of the flange part and the second surface of the permanent magnet is provided on an inner surface of the fixing member, wherein the fixing member is made of a mixture of a glass fiber or a carbon fiber, and a resin. a magnet frame having a cylinder shape; a permanent magnet installed at the magnet frame, being made of a ferrite-based material; a coupling plate coupled to one side of the magnet frame; and a fixing member coupled to the permanent magnet and the coupling plate, characterized in that the coupling plate comprises: a piston coupling part coupled to the piston; a side extension part extending from the piston coupling part and laid on an outer circumference of the magnet frame; and a flange part extending in an outer radial direction of the magnet frame from the side extension part and having a contact part coupled to an end portion of the permanent magnet, wherein the permanent magnet comprises: a first surface coupled to an outer circumference of the magnet frame; and a second surface disposed in a direction opposite to the first surface, wherein a surface connecting an end portion of the flange part and the second surface of the permanent magnet is provided on an inner surface of the fixing member, wherein the fixing member is made of a mixture of a glass fiber or a carbon fiber, and a resin. a piston coupling part coupled to the piston; a side extension part extending from the piston coupling part and laid on an outer circumference of the magnet frame; and a flange part extending in an outer radial direction of the magnet frame from the side extension part and having a contact part coupled to an end portion of the permanent magnet, wherein the permanent magnet comprises: a first surface coupled to an outer circumference of the magnet frame; and a second surface disposed in a direction opposite to the first surface, wherein a surface connecting an end portion of the flange part and the second surface of the permanent magnet is provided on an inner surface of the fixing member, wherein the fixing member is made of a mixture of a glass fiber or a carbon fiber, and a resin. a first surface coupled to an outer circumference of the magnet frame; and a second surface disposed in a direction opposite to the first surface, wherein a surface connecting an end portion of the flange part and the second surface of the permanent magnet is provided on an inner surface of the fixing member, wherein the fixing member is made of a mixture of a glass fiber or a carbon fiber, and a resin.