US Patent 10414537 Packing box

An aspect of the invention is directed to a packing box in which at least part of an opening through which to insert and take out an object to be packed is closed by inside lids that are opposed to each other in a plane, wherein: the inside lids have a cut portion including a cut that is shaped so as to be suitable for the external shape of a portion of the object and folded portions formed by folding the respective inside lids, and, when the inside lids are closed, the cut is fitted with the portion of the object housed in the packing box to fix the object in a state that walls, opposed to each other, of the respective folded portions are in contact with each other.