The present invention relates to a process for producing a substrate provided with a metal pattern by forming a pattern of a metal layer on a substrate using a laser light, the process including: a step of preparing a substrate in which the metal layer is formed on a surface thereof; a step of forming on the metal layer an assist layer which comprises a metal material different from that of the metal layer and which has a light absorptivity for the laser light different from that of the metal layer, thereby forming a metal laminate on the substrate; and a step of patterning the metal layer by irradiating the metal laminate with the laser light to remove a laser light-irradiated portion of the metal laminate, thereby forming a metal pattern on the substrate.