PURPOSE: To manufacture a plastic mold ← excellent in an electromagnetic shield property.

CONSTITUTION: Sheet-shaped articles 2 made of thermoplastic made of thermoplastic plastic composition mixed with a fibrous conductive material 1 are molded into a desired shape and the connection parts 4 of said molded articles 3 are cut off, and the fibrous conductive materials 1 inside the thermoplastic plastic layers 5 of said sheet-shaped articles 2 are exposed on the surfaces of the new connection parts 4. Two molds 3 (for instance, a body and a lid of a basket) are fitted into and the fibrous conductive materials 1 exposed on the connection parts 4 come in contact each other so as to improve an electromagnetic property.