It is to provide a packaging container comprising: a synthetic resin container body (3) having a flange part (2) at a periphery of an opening at an upper end thereof ; and a container cap having a top board part (4) and a skirt part (5) provided such that it is suspended from a periphery of the top board part, and wherein the top board part (4) is heat-sealed onto an upper surface of the flange part (2) of the container body (3); wherein the packaging container has a first cutout part (7) at an upper end of an outer edge of the flange part (2). By providing a first cutout part (7), a packaging container possible to achieve sealing with the container cap stably, and to open the sealing easily and surely as well can be provided, by suppressing the effect of a molten resin on a folded corner part of the skirt of the container cap when the container body (3) is heat-sealed with the container cap.
