<p>To minimize the reduction in internal volume due to flexural deformation and to prevent squirting and spilling of a contained liquid when a user grips a container, a grip part (6) which collapses toward the interior of the container and approaches the other side face is formed on at least one of the side faces opposing a body part (3) so that when a finger is placed on the grip part (6) while the container is being opened or after the container is opened, the inner faces of the opposing side faces of the body part (3) are able to make contact with each other due to the flexural deformation caused by a gripping force acting on the grip part (6).</p>
