To provide a container with a lid in which a container lid can seal an open container body in both before and after thermal contraction of the open container body.SOLUTION: A container with a lid comprises an open container body and a container lid which is detachably fitted to the opening side of the open container body, the open container body being thermally formed from a synthetic resin sheet and having heat shrink property by heating, the open container body and the container lid project toward the opening of the open container body at respective peripheries, and have a body flange portion and a lid flange portion that are annularly provided flange portions, and after thermally contracted by the heating of the open container body, the lid flange portion in the container lid is fitted into the body flange portion to fit into the open container body.SELECTED DRAWING: Figure 8...

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