Provided is a sealant film for a retort food packaging container in which heat resistance at a retort temperature and shock resistance at a low temperature are balanced at a high level beyond the limit of a conventional technology or a wide processable temperature range and shock resistance at a low temperature are balanced. The problem is solved by the sealant film for a retort food packaging container comprising a seal layer, a core layer, and a laminate layer each containing straight-chain polyethylene, wherein each of the layers has specific density and/or is polymerized by a specific catalyst, or has a specific heat melting ratio at 121 degrees centigrade.
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