Physical foaming agent introduction filter, and apparatus and method for producing foamed molded product

A physical foaming agent introduction filter used when a physical foaming agent is introduced into molten resin in a starved state, the filter comprising:

• a filter body;
• and
• a plurality of fine holes provided in the filter body to pass through the filter body in a thickness direction of the filter body,
• wherein each of the fine holes includes:
• a resin-contact-side hole that opens toward one surface side of the filter body, and that is adapted to be in contact with the molten resin;
• and
• a physical foaming agent introduction hole that opens toward another surface side of the filter body, and that communicates with the resin-contact-side hole, to allow the physical foaming agent to be introduced into the physical foaming agent introduction hole, and
• wherein the resin-contact-side hole has a diameter that is equal to or smaller than a diameter of the physical foaming agent introduction hole, and that is 10 to 80 μm.