Production method of suspension board with circuit

A production method of a suspension board with circuit that can provide reduced number of man-hour and complicated processes for forming the ground terminal, to provide production cost reduction. An insulating base layer 4 having a base opening portion 3 is formed on a metal board 2 at a ground terminal 13 forming position, and a thin metal film 5 is formed on the metal board 2 exposed in the base opening portion 3 and on the insulating base layer 4 . Then, a conductive pattern 7 is formed on the thin metal film 5 . Then, an insulating cover layer 9 covering the conductive pattern 7 and having a cover opening portion 8 which correspond in position to the base opening portion 3 is formed on the insulating base layer 4 . Then, a metal board opening portion 11 from which the base opening portion 3 and the insulating base layer 4 around it are exposed is formed in the metal board 2 . Then, an electrolytic plating layer 12 is formed on each side of the conductive pattern 7 exposed in the cover opening portion 8 , feeding electric power from the conductive pattern 7 , and a metal filling layer 14 is formed in the metal board opening portion 11 , to allow the electrolytic plating layer 12 and the metal board 2 to be conductive with each other.