A packaging container , comprising: a first member ; a second member configured to engage with the first member integrally; an inner lid disposed between the first member and the second member ; a stored item containing part opening from an engaged portion of the first member that is engaged with the second member , and configured to contain a stored item ; a chemical agent containing part opening from the engaged portion of the second member that is engaged with the first member , the chemical agent containing part being formed separately from the stored item containing part , and configured to contain a chemical agent ; and a ventilation path in which the stored item containing part and the chemical agent containing part are in communication, the ventilation path being formed in an inner space defined by the first member and the second member , wherein the ventilation path is formed on a lateral side of the stored item containing part , characterized in that the packaging container further comprises: a groove including ends on both sides in a circumferential direction of a single face of an inner wall of the stored item containing part , formed in an approximately C shape connecting the ends, and disposed at a position at least partially facing the chemical agent containing part when engaging the first member with the second member ; an ear part formed laterally extending from the inner lid and disposed facing the groove in engaging the first member with the second member ; and a recess formed curving inward to a central side of the inner lid from an end of the ear part , and disposed between a part of the groove and the chemical agent containing part in engaging the first member with the second member , wherein the groove and the recess form the ventilation path . a first member ; a second member configured to engage with the first member integrally; an inner lid disposed between the first member and the second member ; a stored item containing part opening from an engaged portion of the first member that is engaged with the second member , and configured to contain a stored item ; a chemical agent containing part opening from the engaged portion of the second member that is engaged with the first member , the chemical agent containing part being formed separately from the stored item containing part , and configured to contain a chemical agent ; and a ventilation path in which the stored item containing part and the chemical agent containing part are in communication, the ventilation path being formed in an inner space defined by the first member and the second member , a groove including ends on both sides in a circumferential direction of a single face of an inner wall of the stored item containing part , formed in an approximately C shape connecting the ends, and disposed at a position at least partially facing the chemical agent containing part when engaging the first member with the second member ; an ear part formed laterally extending from the inner lid and disposed facing the groove in engaging the first member with the second member ; and a recess formed curving inward to a central side of the inner lid from an end of the ear part , and disposed between a part of the groove and the chemical agent containing part in engaging the first member with the second member , wherein the groove and the recess form the ventilation path . <EOS>