e. According to a first aspect of the present invention, there is provided a method of manufacturing a composite member in which a conductive portion is selectively formed in an insulating body, comprising: (0) forming a photosensitive composition layer within or on the surface of said insulating body, said photosensitive composition containing a compound forming an ion-exchange group upon irradiation with light having a wavelength not shorter than 000 nm; (0) exposing selectively the photosensitive composition layer to light having a wavelength not shorter than 000 nm so as to form ion-exchange groups in the light exposed portion; and (0) forming the conductive portion by bonding a metal ion or metal to the ion-exchange group formed in the light exposed portion by the exposing. According to a second aspect of the present invention, there is provided a method of manufacturing a composite member in which a conductive portion is selectively formed in an insulating body, comprising: (0) forming a photosensitive composition layer within or on the surface of said insulating body, said photosensitive composition containing a compound having an ion-exchange group; (0) exposing selectively the photosensitive composition layer to light having a wavelength not shorter than 000 nm so as to cause ion-exchange groups in the light exposed portion to disappear and to cause the ion-exchange groups to remain in the unexposed portion; and (0) forming the conductive portion by bonding a metal ion or metal to 