To provide a paper container that is processible by retort sterilization and suitable to be put in a microwave oven.

To a paper container constructed of a container main body having an opening part, a trunk part 12 and a bottom part 13 while being equipped at the periphery of its opening part with an opening edge part 17 curling toward the outside and made up by welding its upper and lower layers together with pressure and a tapelike laminated film 20 for covering both of inner and outer end edges produced at an overlapping part of the trunk part of the container main body, an opening edge peripheral member 35 positioned at the periphery of the opening of the container main body and to be welded by heating for covering the external side face and the underside of the opening edge part and a curled bottom annular member 34 positioned along the curled bottom part at the internal wall and to be welded by heating are formed by an insert injection molding wherewith heat-melted polypropylene is injected into a metal mold wherein the container main body is inserted and arranged beforehand.