Patent ID: 8348087

Claim:
A cold box comprising: an outer bag which is rectangular and has an upper opening; a lid which closes the upper opening of the outer bag; and a thermal insulator which is foldable and is detachably housed inside the outer bag, wherein the thermal insulator is formed from a pouch-covered thermal insulation material, wherein the thermal insulator comprises: a rectangular bottom wall; a top wall attached to the lid; a front wall vertically extending from one long side of the rectangular bottom wall; a rear wall vertically extending from the other long side of the rectangular bottom wall, an inner face of the rear wall being opposed to an inner face of the front wall; and a pair of side walls vertically extending from a pair of short sides of the rectangular bottom wall, respectively, wherein each of the side walls comprises a fixed part disposed adjacent to the rear wall, and a turning part disposed adjacent to the front wall, wherein the fixed parts are fixed to side faces of the rear wall, respectively, and the turning parts are rotatably coupled to front faces of the fixed parts, respectively, and wherein, when the thermal insulator is folded, the front faces of the turning parts face each other; the front faces of the turning parts face the front wall when the thermal insulator is unfolded.