Embodiments of the invention provide a packing box wherein strength is improved and efficiency of opening, content retrieval, etc. is improved. Embodiments of the invention provide a packing box obtained from an upper cover and a lower box configured from cardboard for accommodating articles therein, in which: the upper cover is obtained from a top board that covers the entire interior of the lower box and side boards that extend vertically downward from each side of the top board and substantially cover the side surfaces of the lower box; and at least one notch is provided on one of the lower edges of the upper cover.