a packaging case suitable for packaging an elongated article and being displayed in a shop or an exhibition hall is provided . the packaging case comprises : an inner case able to accommodate the article and an outer sleeve capable of externally sheathing the inner case , wherein the inner case can move back and forth into and out of the outer sleeve , the packaging case further comprises a flexible strip , one end of the strip is fixed to an outer surface of the inner case , the other end of the strip is fixed to an inner surface of the outer sleeve , and the outer surface and the inner surface are two surfaces which are opposed to each other and kept close to mutually when the inner case is sheathed in the outer sleeve .