In a process for manufacturing a multilayer printed circuit board which comprises forming a resin insulating layer (12) and a conductor circuit (19) on a resin substrate (1), a metal layer (14) composed of at least one metal selected from among the metal elements of the 4 th through 7 th periods in Group 4A through Group 1B of the long-form periodic table of the elements, Al and Sn is formed on the surface of the resin insulating layer (12), the surface of the metal layer (14) is then cleaned with an acid, and thereafter the conductor circuit (19) is constructed on the metal layer (14).