To provide a coin storage case which can solve an issue of a conventional coin storage case that an openable/closable lower flat mounting plate forming a recess mounting groove into which a semicircular part of a coin is inserted is openable/closable causing the openable/closable lower side flat mounting plate to be sometimes opened to release coins from the coin storage case when the coin storage case is put in bag or the like.

In the coin storage case, an openable/closable lower flat mounting plate to configure a recess mounting groove to which only a semicircular part of a coin is inserted is opened upward at an openable/closable folding line to detachably mount the coin therein, and the recess mounting groove is kept in the horizontal direction to make a semicircular part not inserted thereinto abut on a fixed annular mounting plate. The coin storage case is provided with an outer plate attached an opening/closing portion overlapped on the coin mounted on the fixing portion adhering to the mounting board with the openable/closable folding line parallel to partition line of the ring shaped mounting plate. A coin can be stablly held in a condition mounted in the horizontal direction by mutually fitting the openable/closable portion of the outer plate by corresponding convex/concave or adhering by a detachable adhesive tape.