An identification method for identifying a component or a product attached to an identification mark having a skeleton part (1a, 1b), wherein a predetermined area of the skeleton part of the identification mark is defined as a matching area, the method comprising: forming the identification mark by a mold; forming a textured pattern in said matching area of the skeleton part by the mold and subsequently applying a finish process of generating an individual microscopic random bumps-and-dips pattern to the matching area; capturing an image of the textured pattern in the matching area for each mold before the finish process is applied and capturing an image of the textured pattern in the matching area for each identification mark after the finish process is applied; normalizing position and posture of the captured images by normalizing position and posture of the skeleton part in the captured image; storing a mold difference image feature to a memory, the mold difference image feature being an image feature of the textured pattern, for each mold before the finish process is applied and storing an individual object difference image feature, the individual object difference image feature being an image feature after the finish process is applied, for each identification mark; capturing an image of the textured pattern in the matching area of the skeleton part of the identification mark attached to a component or product to be identified; extracting an image feature of the textured pattern in the matching area of the skeleton part of the identification mark attached to the component or the product to be identified; and identifying said component or product of the second image feature by: firstly matching the image feature of the textured pattern on the matching area of the skeleton part of the identification mark attached to the component or the product to be identified with the mold difference image feature to thereby distinguish a mold with which the identification mark attached to the component or the product to be identified is produced, and secondly matching the image feature of the textured pattern on the matching area of the skeleton part of the identification mark attached to the component or the product to be identified with an individual object difference image feature of identification marks produced with the distinguished mold. forming the identification mark by a mold; forming a textured pattern in said matching area of the skeleton part by the mold and subsequently applying a finish process of generating an individual microscopic random bumps-and-dips pattern to the matching area; capturing an image of the textured pattern in the matching area for each mold before the finish process is applied and capturing an image of the textured pattern in the matching area for each identification mark after the finish process is applied; normalizing position and posture of the captured images by normalizing position and posture of the skeleton part in the captured image; storing a mold difference image feature to a memory, the mold difference image feature being an image feature of the textured pattern, for each mold before the finish process is applied and storing an individual object difference image feature, the individual object difference image feature being an image feature after the finish process is applied, for each identification mark; capturing an image of the textured pattern in the matching area of the skeleton part of the identification mark attached to a component or product to be identified; extracting an image feature of the textured pattern in the matching area of the skeleton part of the identification mark attached to the component or the product to be identified; and identifying said component or product of the second image feature by: firstly matching the image feature of the textured pattern on the matching area of the skeleton part of the identification mark attached to the component or the product to be identified with the mold difference image feature to thereby distinguish a mold with which the identification mark attached to the component or the product to be identified is produced, and secondly matching the image feature of the textured pattern on the matching area of the skeleton part of the identification mark attached to the component or the product to be identified with an individual object difference image feature of identification marks produced with the distinguished mold. firstly matching the image feature of the textured pattern on the matching area of the skeleton part of the identification mark attached to the component or the product to be identified with the mold difference image feature to thereby distinguish a mold with which the identification mark attached to the component or the product to be identified is produced, and secondly matching the image feature of the textured pattern on the matching area of the skeleton part of the identification mark attached to the component or the product to be identified with an individual object difference image feature of identification marks produced with the distinguished mold.