The subject innovation relates to an instrument case to protect the certificate, such as diploma or traded, for diploma, wichokjang conventional instrument case 30 has the core 31 and the intermediate member 32, the exterior closing member (33), Cotton (34 ), triangular fitting piece 35, etc. attached to the intermediate member (32) in addition to high volume of the components both core member 31 and the installation of the external closing member (33), Cotton 35 and the triangular fitting piece (35 ) manpower, time, and cost is picked much, so is not only picked much the production cost production is very troublesome in a direction perpendicular to the bar, the inner central portion had a problem that fall significantly productive folding of such adhering operation concave inlet ( characterized in that a 11a) forms a Flocking treatment layer 12 on the inner surface and the outer surface of the core member 11 is provided, and the heat-sealed eight triangular fitting piece 13 both to the inner surface sides of the core member (11) According to the present invention that a simpler and, for example by extrusion Even the low cost Flocking treatment to the core material 11 can be produced, and therefore able to create a triangular fitting piece 13 instrument case 10 easily by simply attaching a large manpower, time and cost of manufacture of the instrument case to be able to reduce the effect can be obtained such as being able to greatly enhance the productivity of doemeun course certificate case allows significantly reduce the cost of production of the certificate case.
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