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 the dispensing cap includes a cylindrical wall covering the outer circumference of the mouth portion, and the cylindrical wall includes a lower end portion fitted to an outer circumferential surface of the outer layer body to define the vent region formed between the cylindrical wall and the mouth portion, and the throttle passage is configured so that the need for a check valve is eliminated, the throttle passage is provided below the upper opening, and when the outer layer body is squeezed for dispensing the content, the throttle passage creates a predetermined resistance to ambient air flowing in the vent region and the pressure of air held between the inner layer body and the outer layer body can be maintained high enough for a while for the content to be dispensed from the inner layer body, characterised in that: the throttle passage is provided below the aperture. 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, 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 the dispensing cap includes a cylindrical wall covering the outer circumference of the mouth portion, and the cylindrical wall includes a lower end portion fitted to an outer circumferential surface of the outer layer body to define the vent region formed between the cylindrical wall and the mouth portion, and the throttle passage is configured so that the need for a check valve is eliminated, the throttle passage is provided below the upper opening, and when the outer layer body is squeezed for dispensing the content, the throttle passage creates a predetermined resistance to ambient air flowing in the vent region and the pressure of air held between the inner layer body and the outer layer body can be maintained high enough for a while for the content to be dispensed from the inner layer body, characterised in that: the throttle passage is provided below the aperture.