To prevent the molding face of a molding tool from being corroded and thereby, upgrade the durability, in the molding tool made of a beryllium copper alloy to be used for injection-molding plastic parts for a photographic sensitized material.

In the molding tool for plastic parts for a photographic sensitized material requiring sufficient durability, the molding faces 14a and 15 of the molding tool made of a beryllium copper alloy are covered by a coating layer 21 including a boron-containing layer. This coating layer 21 is preferably constituted of a boron carbide layer formed on the molding faces 14a and 15 and a boron nitride layer formed on the upper surface of the boron carbide layer. The overall thickness of the coating layer 21 is held down to 2 μm.