Double-walled container

A double container, comprising:

• an inner layer body provided with an upper opening contiguous with a content container portion;
• an outer layer body accommodating the inner layer body and including a mouth portion provided with an aperture, through which aperture ambient air is introduced between the inner layer body and the outer layer body;
• and
• a dispensing cap provided with a content dispensing spout and fitted to the mouth portion of the outer layer body, wherein
• the double container further comprises:
• an inside plug provided with a dispensing passage and fitted to the upper opening, the dispensing passage placing the container portion in communication with the dispensing spout;
• and
• a check valve configured to open and close the dispensing passage,
• a vent region is provided inside the dispensing cap, and
• a throttle passage is provided in a passage extending from an ambient air introducing hole through the vent region to the aperture, the ambient air introducing hole placing the vent region in communication with the outside, wherein an air check valve for holding ambient air introduced between the inner layer body and the outer layer body is not provided in the passage.