Provided is a sealant film, characterized in that: the sealant film comprises a laminated film in which an outer layer, an intermediate layer, and an inner layer are laminated; the outer layer and the inner layer contain a polyethylene-based resin; the intermediate layer contains a straight-chain low-density polyethylene and a cyclic olefin-based resin; the cyclic olefin-based resin content in the resin constituents contained in the intermediate layer is 20–40% by mass; and the standardized molecular orientation Morc value, when the reference thickness measured using a microwave molecule orientation meter is 60 µm, is at least 1.025. Through the use of the sealant film, outstanding ease of tearing and straight cutting properties can be achieved, and during high-temperature processing, inner-surface fusion of a packaging material and an uneven exterior-appearance thereof can be suppressed.
