A method of manufacturing a narrow outer frame touch input sheet having a anticorrosion layer, the method comprising: sequentially laminating a transparent conductive film, a light blocking conductive film, and a first resist layer on both sides of a transparent base sheet; partially exposing the first resist layer on both sides simultaneously and developing the first resist layer so as to pattern the first resist layer; etching and removing the transparent conductive film and the light blocking conductive film simultaneously where the first resist layer has been removed so as to form an electrode pattern in a center window part of the touch input sheet on both sides of the base sheet and a fine wiring circuit pattern in an outer frame part of the touch input sheet surrounding the center window part on both sides of the base sheet whereby the electrode pattern and the fine wiring circuit pattern are formed of the laminated transparent conductive film and the light blocking conductive film; removing the first resist layer and then laminating a second resist layer with anticorrosion agent only on parts of the revealed light blocking conductive film; etching and removing only the parts of the light blocking conductive film on which the second resist layer is not laminated so as to reveal the transparent conductive film in the entire center window part on both sides of the base sheet and at a terminal portion to be formed in the outer frame part, and further performing side etching of the revealed end faces of the light blocking conductive film at the boundary between the center window part and the outer frame part, and at the terminal portion so as to make a visor structure of the second resist layer; and softening the second resist layer of the visor structure by heat treatment so as to cover the revealed end faces of the remaining light blocking conductive film, and keeping the second resist layer in the state obtained after the softening step as the anticorrosion layer. sequentially laminating a transparent conductive film, a light blocking conductive film, and a first resist layer on both sides of a transparent base sheet; partially exposing the first resist layer on both sides simultaneously and developing the first resist layer so as to pattern the first resist layer; etching and removing the transparent conductive film and the light blocking conductive film simultaneously where the first resist layer has been removed so as to form an electrode pattern in a center window part of the touch input sheet on both sides of the base sheet and a fine wiring circuit pattern in an outer frame part of the touch input sheet surrounding the center window part on both sides of the base sheet whereby the electrode pattern and the fine wiring circuit pattern are formed of the laminated transparent conductive film and the light blocking conductive film; removing the first resist layer and then laminating a second resist layer with anticorrosion agent only on parts of the revealed light blocking conductive film; etching and removing only the parts of the light blocking conductive film on which the second resist layer is not laminated so as to reveal the transparent conductive film in the entire center window part on both sides of the base sheet and at a terminal portion to be formed in the outer frame part, and further performing side etching of the revealed end faces of the light blocking conductive film at the boundary between the center window part and the outer frame part, and at the terminal portion so as to make a visor structure of the second resist layer; and softening the second resist layer of the visor structure by heat treatment so as to cover the revealed end faces of the remaining light blocking conductive film, and keeping the second resist layer in the state obtained after the softening step as the anticorrosion layer.