To clarify the contrast between the irradiation part and the non- irradiation part of laser, and improve the visibility of marked parts by providing a coated layer specified in its wall thickness and surface luster with resin having a specified heat conductivity and melting point on the surface with which the laser marking parts of a molding are brought into contact.

The injection mold is used which is formed with a coated layer satisfying simultaneously conditions denoted by (a) and (b) in a mold inner surface, i.e., in a cavity inner surface defined between both molds created by mating the protrusion mold with recess mold. Herein, formation is done with a resin layer consisting of resin having a heat conductivity of 1×10-4-30×10-4cal/cm.sec°C, and a melting point or softening point of 15°C or higher, or having no melting point or softening point (a). For such resin showing these physical values, polyethyleneterephthalate, polytertrafluoroethylene, or the like can be give. The coating layer (b) is made 60% or more in its surface luster, and the resin layer is made 5-1000μm in its wall thickness.