Packaging container

A packaging container comprising:

• a housing part that houses a content;
• a flange part provided on an outer circumference of an opening of the housing part integrally with the housing part;
• a sealing ridge provided on a top face of the flange part, annularly formed over an entire circumference of the flange part so as to be protruded upward, and having a first protrusion that protrudes outward in a plane direction of the flange part at a position corresponding to an opening start part, wherein the first protrusion has a pointed end;
• and
• a second protrusion provided on the top face of the flange part so as to be protruded upward, and forming a gap along an inner face of the first protrusion on an inner circumferential side of the first protrusion of the sealing ridge, wherein the second protrusion is formed conforming to the first protrusion, the second protrusion having a triangular prism shape.

A packaging container comprising:

• a housing part that houses a content;
• a flange part provided on an outer circumference of an opening of the housing part integrally with the housing part;
• a sealing ridge provided on a top face of the flange part, annularly formed over an entire circumference of the flange part so as to be protruded upward, and having a first protrusion that protrudes outward in a plane direction of the flange part at a position corresponding to an opening start part;
• and
• a second protrusion provided on the top face of the flange part so as to be protruded upward, and forming a gap along an inner face of the first protrusion on an inner circumferential side of the first protrusion of the sealing ridge, wherein a height of the second protrusion, above the top face of the flange part, is lower than a height of the first protrusion above the top face of the flange part.