A filtering discharge container comprising: an outer layer bottle including a squeeze-deformable body and a mouth portion provided at an upper end of the body; an inner layer bag provided in the outer layer bottle and having an opening connected to the mouth portion of the outer layer bottle; and a mouth cap attached to the mouth portion of the outer layer bottle; the outer layer bottle having an inlet hole through which outer air is introduced between the outer layer bottle and the inner layer bag; the mouth cap having an outlet passage through which a content liquid contained in the inner layer bag is discharged from the inner layer bag; the outlet passage being provided with a filter; the filtering discharge container further comprising: an engagement portion provided on an upstream side of the filter in the outlet passage of the mouth cap; characterized by a plug engaged with the engagement portion in such a manner that the plug can be disengaged from the engagement portion by an internal pressure of the inner layer bag increased by squeeze-deforming the body of the outer layer bottle; wherein the outlet passage is closed with the plug engaged with the engagement portion and, after the plug is disengaged from the engagement portion, liquid communication is established between an inside of the inner layer bag and the filter wherein the container further comprises a resilient support member which urges the plug away from the engagement portion. an outer layer bottle including a squeeze-deformable body and a mouth portion provided at an upper end of the body; an inner layer bag provided in the outer layer bottle and having an opening connected to the mouth portion of the outer layer bottle; and a mouth cap attached to the mouth portion of the outer layer bottle; the outer layer bottle having an inlet hole through which outer air is introduced between the outer layer bottle and the inner layer bag; the mouth cap having an outlet passage through which a content liquid contained in the inner layer bag is discharged from the inner layer bag; the outlet passage being provided with a filter; the filtering discharge container further comprising: an engagement portion provided on an upstream side of the filter in the outlet passage of the mouth cap; characterized by a plug engaged with the engagement portion in such a manner that the plug can be disengaged from the engagement portion by an internal pressure of the inner layer bag increased by squeeze-deforming the body of the outer layer bottle; wherein the outlet passage is closed with the plug engaged with the engagement portion and, after the plug is disengaged from the engagement portion, liquid communication is established between an inside of the inner layer bag and the filter wherein the container further comprises a resilient support member which urges the plug away from the engagement portion. an engagement portion provided on an upstream side of the filter in the outlet passage of the mouth cap; characterized by a plug engaged with the engagement portion in such a manner that the plug can be disengaged from the engagement portion by an internal pressure of the inner layer bag increased by squeeze-deforming the body of the outer layer bottle; wherein the outlet passage is closed with the plug engaged with the engagement portion and, after the plug is disengaged from the engagement portion, liquid communication is established between an inside of the inner layer bag and the filter wherein the container further comprises a resilient support member which urges the plug away from the engagement portion.