COMPOSITE MATERIAL LUNCH BOX

PROBLEM TO BE SOLVED: To provide a composite material lunch body which is combined by a synthetic resin inner box and a paper outer box, does not need a margin in the paper outer box, can be assembled without bonding the inner box and the outer box with adhesive or the like, and is easy to be sorted out when discarding.SOLUTION: The composite material lunch body is combined by the synthetic resin inner box whose upper side is open, and the paper outer box which covers the lateral side and the bottom side of the inner box. The outer box is formed of one piece of paper, and includes: a bottom plate; and a lateral plate bent upward from a periphery of the bottom plate, in which a bent piece being bent outwardly downward from the upper end of the lateral part of the inner box through a ceiling part with the short width. When the inner box is stored inside the outer box, and the upper end of the lateral plate of the outer box is inserted in the bent piece of the inner box, the upper end of the outer box and the bent part of the inner box are detachably locked. Thus, the inner box can be fixed inside the outer box.