A linear compressor comprising: a cylinder defining a compression space; a piston configured to reciprocate in an axis direction within the compression space defined by the cylinder; and a linear motor configured to provide power to the piston, wherein the linear motor comprises: an inner stator disposed outside of the compression space defined by the cylinder, the inner stator comprising a center core and a side core (212a, 212b) disposed on at least one side of the center core; an outer stator that is spaced outward from the inner stator in a radius direction; and a magnet disposed in an airgap defined between the inner stator and the outer stator, the magnet being configured to move within the airgap defined between the inner stator and the outer stator and reciprocate the piston based on movement of the magnet, wherein the side core of the inner stator comprises: a core body; characterized in that: the side core (212a, 212b) comprising a plurality of core plates that are stacked on each other and a side fixing member configured to fix the plurality of core plates, and that the side core comprises: a guide device that is coupled to the core body and that is configured to expose or lead out a power line to an outside of the side core, the guide device comprises a guide body inserted into the core body and a seat part that is defined in the guide body and that is configured to serve as a seat for the side fixing member, and a surface of the guide body is recessed to define the seat part. a cylinder defining a compression space; a piston configured to reciprocate in an axis direction within the compression space defined by the cylinder; and a linear motor configured to provide power to the piston, wherein the linear motor comprises: an inner stator disposed outside of the compression space defined by the cylinder, the inner stator comprising a center core and a side core (212a, 212b) disposed on at least one side of the center core; an outer stator that is spaced outward from the inner stator in a radius direction; and a magnet disposed in an airgap defined between the inner stator and the outer stator, the magnet being configured to move within the airgap defined between the inner stator and the outer stator and reciprocate the piston based on movement of the magnet, wherein the side core of the inner stator comprises: a core body; characterized in that: the side core (212a, 212b) comprising a plurality of core plates that are stacked on each other and a side fixing member configured to fix the plurality of core plates, and that the side core comprises: a guide device that is coupled to the core body and that is configured to expose or lead out a power line to an outside of the side core, the guide device comprises a guide body inserted into the core body and a seat part that is defined in the guide body and that is configured to serve as a seat for the side fixing member, and a surface of the guide body is recessed to define the seat part. an inner stator disposed outside of the compression space defined by the cylinder, the inner stator comprising a center core and a side core (212a, 212b) disposed on at least one side of the center core; an outer stator that is spaced outward from the inner stator in a radius direction; and a magnet disposed in an airgap defined between the inner stator and the outer stator, the magnet being configured to move within the airgap defined between the inner stator and the outer stator and reciprocate the piston based on movement of the magnet, wherein the side core of the inner stator comprises: a core body; characterized in that: the side core (212a, 212b) comprising a plurality of core plates that are stacked on each other and a side fixing member configured to fix the plurality of core plates, and that the side core comprises: a guide device that is coupled to the core body and that is configured to expose or lead out a power line to an outside of the side core, the guide device comprises a guide body inserted into the core body and a seat part that is defined in the guide body and that is configured to serve as a seat for the side fixing member, and a surface of the guide body is recessed to define the seat part. a core body; characterized in that: the side core (212a, 212b) comprising a plurality of core plates that are stacked on each other and a side fixing member configured to fix the plurality of core plates, and that the side core comprises: a guide device that is coupled to the core body and that is configured to expose or lead out a power line to an outside of the side core, the guide device comprises a guide body inserted into the core body and a seat part that is defined in the guide body and that is configured to serve as a seat for the side fixing member, and a surface of the guide body is recessed to define the seat part. a guide device that is coupled to the core body and that is configured to expose or lead out a power line to an outside of the side core, the guide device comprises a guide body inserted into the core body and a seat part that is defined in the guide body and that is configured to serve as a seat for the side fixing member, and a surface of the guide body is recessed to define the seat part.