A double-walled container comprising: a bottle-shaped outer layer body including a cylindrical mouth , a trunk that is connected to the mouth and has a diameter larger than a diameter of the mouth , and a bottom connected to the trunk ; and an inner layer body that is accommodated inside the outer layer body , has a shape corresponding to a shape of the outer layer body and is configured to be deformed to undergo volume reduction, the mouth being provided with at least one air introduction hole that passes through the outer layer body and introduces air between the outer layer body and the inner layer body, characterized by the double-walled container further comprising: an engaging part for plug used for fitting a dispensing tool to the mouth by plugging; a neck ring provided around the mouth ; and a plurality of ribs that are provided on at least an upper part of the trunk and extend in a direction from the mouth toward the bottom ; wherein the neck ring includes at least one diameter expansion part of ring (11d1) whose diameter is expanded by bending a peripheral wall forming the mouth so that it projects radially outward and at least one intermittent part of ring (11d2) that is circumferentially adjacent to the at least one diameter expansion part of ring (11d1) and whose diameter is less expanded than that of the at least one diameter expansion part of ring (11d1), and the plurality of ribs include at least one expanded diameter part rib whose upper end (14a1) is disposed immediately below the at least one diameter expansion part of ring and at least one intermittent part rib whose upper end (14b1) is disposed immediately below the at least one intermittent part of ring (11d2) located immediately below the at least one air introduction hole , and the at least one intermittent part rib includes an extending portion (14b2) extending beyond the upper end (14a1) of the at least one expanded diameter part rib . the double-walled container further comprising: an engaging part for plug used for fitting a dispensing tool to the mouth by plugging; a neck ring provided around the mouth ; and a plurality of ribs that are provided on at least an upper part of the trunk and extend in a direction from the mouth toward the bottom ; wherein the neck ring includes at least one diameter expansion part of ring (11d1) whose diameter is expanded by bending a peripheral wall forming the mouth so that it projects radially outward and at least one intermittent part of ring (11d2) that is circumferentially adjacent to the at least one diameter expansion part of ring (11d1) and whose diameter is less expanded than that of the at least one diameter expansion part of ring (11d1), and the plurality of ribs include at least one expanded diameter part rib whose upper end (14a1) is disposed immediately below the at least one diameter expansion part of ring and at least one intermittent part rib whose upper end (14b1) is disposed immediately below the at least one intermittent part of ring (11d2) located immediately below the at least one air introduction hole , and the at least one intermittent part rib includes an extending portion (14b2) extending beyond the upper end (14a1) of the at least one expanded diameter part rib . <EOS>