Packaging container and packaged product contained in said packaging container, and manufacturing method and manufacturing apparatus for said packaging container

A manufacturing method for a packaging container, comprising the steps of arranging and conveying a plurality of container main bodies, each of which has a bottom face part, sidewall parts, and a flange formed at an upper end part periphery of the sidewall parts, and serially heat-sealing a lid material to the flanges of the container main bodies, wherein

• in each of the container main bodies, a pair of opposing sidewall parts have an identical shape, and upper end parts of the pair of sidewall parts are at least partly positioned higher than another pair of opposing sidewall parts:
• the container main bodies are arranged and conveyed in such a manner that the pair of opposing sidewall parts of each of the container main bodies are positioned parallel to a conveyance direction of the container main bodies;
• the lid material formed of a flat film or sheet is reeled out from a reel roll and forwarded through a dancer roll;
• and
• the lid material is heat-sealed to the flange of each of the container main bodies by using a heat-seal block while correcting and adjusting a sag of the lid material that occurs between reeling out the lid material and heat-sealing the lid material to the flange of each of the container main bodies by using the dancer roll or another dancer roll different from that dancer roll, so that the lid material follows the contour shape of the upper end parts of the pair of opposing sidewall parts.