Abstract: A portable suitcase-type storage case has structural features that enable to stack the case regardless of the surface shape of the bottom and lid casings, without diminishing its pleasing visual appearance of the storage case. A convex-shaped stacking section is provided integrally with the bottom casing at specific locations on a surface of the bottom casing, and a concave-shaped stacking section is provided integrally on a surface of the lid casing at corresponding locations so as to engage with respective convex-shaped stacking sections, in such a way that a radius of curvature of the concave-shaped stacking section is greater than a radius of curvature of the convex-shaped stacking section, and that a center portion of the concave-shaped stacking section is displaced towards outer periphery of the storage case relative to a center portion of the convex-shaped stacking section.