An adhesive layer coating unit configured to continuously apply an adhesive layer having a first width (a) in a longitudinal direction of a first separator, the adhesive layer coating unit comprising: a transfer roller configured to support a bottom surface of the first separator and transfer the first separator; a discharge roller configured to transfer the first separator, which has passed through the transfer roller, in conjunction with the transfer roller while supporting a top surface of the first separator, wherein a coating groove having the first width and a closed curve shape is formed in a circumferential surface of the discharge roller; a coating member configured to inject an adhesive into a space between the discharge roller and the top surface of the first separator which has passed through the transfer roller, wherein as the adhesive flows in the coating groove of the discharge roller, the adhesive layer having the first width is continuously applied on the top surface of the first separator; a case, wherein the transfer roller and the discharge roller are installed inside the case, and both ends between the transfer roller and the discharge roller are finished thereby; and a curing member which emits a light source toward the first separator and cures the adhesive layer, which is continuously applied on the first separator, to a set viscosity, wherein a depth of the coating groove is 5 to 15 μm, and the adhesive layer having a thickness of 5 to 15 μm is applied on the top surface of the first separator, wherein a center point of the discharge roller is positioned on a different vertical line from a center point of the transfer roller, and is positioned above the center point of the transfer roller, wherein the first width (a) is less than a width (b) of the first separator. a transfer roller configured to support a bottom surface of the first separator and transfer the first separator; a discharge roller configured to transfer the first separator, which has passed through the transfer roller, in conjunction with the transfer roller while supporting a top surface of the first separator, wherein a coating groove having the first width and a closed curve shape is formed in a circumferential surface of the discharge roller; a coating member configured to inject an adhesive into a space between the discharge roller and the top surface of the first separator which has passed through the transfer roller, wherein as the adhesive flows in the coating groove of the discharge roller, the adhesive layer having the first width is continuously applied on the top surface of the first separator; a case, wherein the transfer roller and the discharge roller are installed inside the case, and both ends between the transfer roller and the discharge roller are finished thereby; and a curing member which emits a light source toward the first separator and cures the adhesive layer, which is continuously applied on the first separator, to a set viscosity, wherein a depth of the coating groove is 5 to 15 μm, and the adhesive layer having a thickness of 5 to 15 μm is applied on the top surface of the first separator, wherein a center point of the discharge roller is positioned on a different vertical line from a center point of the transfer roller, and is positioned above the center point of the transfer roller, wherein the first width (a) is less than a width (b) of the first separator.