Paper container with lid material, blank material, and paper container

Problem to be solved: To provide a paper container with a lid material, a blank material, and a paper container that can improve openability. Solution: A paper container 1 with a lid material includes a paper container 10 having a paper container 20 and a molded film 40, and a lid material 50. The lid material 50 is sealed to the molding film 40 by an inner seal part H1 and an outer seal part H2 formed over the entire periphery. The inner seal part H1 is formed on a flange piece 25 of the paper container 20. The outer seal part H2 is formed at a position not overlapping with the flange piece 25 in a plan view. On the at least one flange piece 25, at least a part of an outer edge of the inner seal part H1 is convex toward the outside. At least a part...