A metal-resin composite molding is composed of a metal portion and a resin portion. The surface of the metal portion has silanol groups, and the synthetic resin contains an adhesive modifier having adhesive functional groups interacting with the silanol groups. The metal portion and resin portion are bonded together through the interaction between the silanol group and adhesive functional group. The method for manufacturing the metal-resin composite molding includes a step of applying silanol groups to the surface of the metal portion, a step of adding an adhesive modifier having adhesive functional groups interacting with the silanol groups to the synthetic resin thereby producing a molding material, and a step of arranging the metal portion as an insert in a mold for resin molding, melting and forming the molding material in the mold into a resin portion, and at the same time bonding the resin portion to the metal portion through the interaction between the silanol groups and adhesive functional groups.