The laminated film for bonding comprises: a first layer; a second layer disposed opposite to the first layer; and a third layer interposed between the first layer and the second layer, wherein the laminated film comprises a first end having a first thickness and a second end having a second thickness different from the first thickness, and a measuring area disposed between the first end and the second end and having a center thickness, wherein the center thickness is less than or equal to a middle value of the first thickness and the second thickness, wherein a penetration coefficient (Fpe) at the measuring area is 1.35 kgf/mm2*mm or more, and wherein, a ratio of a sum of a thickness of the first layer and a thickness of the second layer to a thickness of the third layer is 100:12 to 24.