FITTING CONTAINER

To provide a fitting container having a substantially square shape with a corner part and capable of reliably fitting a lid body to a container body after heating and shrinking.SOLUTION: In a fitting container comprising a substantially square lid body 100 having a lid side fitting part 150 at a flange part 140 of a lid side corner part 110 and a substantially square container body having a container side fitting part at the flange part of the container side corner part and being composed of a material shrinking after heating and having heat resistance,: a part of the container side fitting part of the container side corner part is positioned outside from the lid side fitting part 150 of the lid side corner part 110 in a state before the container body is heated and shrunk; and the container side fitting part is positioned inside from the lid side...