Abstract: Disclosed herein is a handle fitting structure for a packaging box for holding cakes, a potted plant, or the like. Namely, it represents a fitting structure of a handle to a box body for a packaging box formed by engaging the tips of a bandlike handle with the box body made of an elastic material such as corrugated fiberboard. The fitting structure is provided at each of the two opposite positions on side walls of the box body. The structure includes an insertion slit, with a breadth greater than the handle breadth, through which the tip of the handle is inserted and engaged therewith, an insertion guide provided protrusively from the end of the handle and serving as a guide at the time of insertion of the tip of the handle into the insertion slit, and an engaging part provided at the tip of the handle protruding in the direction opposite to the insertion guide, and engages with the side wall at the upper edge of the insertion slit at the time of insertion of the tip of the handle.