The present invention relates to a lamination apparatus, for a secondary battery, thermally bonding an electrode assembly in which electrodes and a separation membrane are alternately laminated, the apparatus comprising: a transfer member for transferring an electrode assembly; a supporting member for respectively supporting the upper surface and the lower surface of the electrode assembly transferred by the transfer member; a heating member provided on the outer surface of the supporting member and heating the electrode assembly supported by the supporting member; and a movable member for moving the heating member in the direction in which the heating member moves away from the electrode assembly.