A bonding tool comprising: an optical fiber feeding section that is arranged to feed an optical fiber in which a strand is coated with a thermoplastic resin to a surface of a structural body ; a heater that is arranged to melt at least one portion of the thermoplastic resin ; and a pressure-bonding section that is arranged to bring the portion where the thermoplastic resin is melted and the surface of a structural body into contact with each other, and to pressure-bond the optical fiber to the surface; and a casing in which the heater and the pressure-bonding section are accommodated, wherein the pressure-bonding section is formed as a molding roller that is configured to press the optical fiber against the surface of the structural body and the bonding tool is configured such that it can move along the surface of the structural body with the molding roller rotating, wherein the heater is mounted close to the molding roller on an opposite side from the molding roller with respect to the optical fiber so as to be able to melt the thermoplastic resin at least in a portion in contact with the surface of the structural body by heating a surface of the optical fiber opposite to a surface in contact with the molding roller close to the molding roller , the bonding tool being characterised in that the optical fiber feeding section includes an optical fiber winding roller around which the optical fiber is to be wound and from which it can be unwound in operation, and a pair of opposed optical fiber feeding rollers , wherein the optical fiber winding roller , the optical fiber feeding rollers , and the molding roller are configured to be rotated to unwind the optical fiber from the optical fiber winding roller and convey it to the heater and the molding roller through the optical fiber feeding rollers , and wherein the optical feeding section is accommodated in the casing . an optical fiber feeding section that is arranged to feed an optical fiber in which a strand is coated with a thermoplastic resin to a surface of a structural body ; a heater that is arranged to melt at least one portion of the thermoplastic resin ; and a pressure-bonding section that is arranged to bring the portion where the thermoplastic resin is melted and the surface of a structural body into contact with each other, and to pressure-bond the optical fiber to the surface; and a casing in which the heater and the pressure-bonding section are accommodated, wherein the pressure-bonding section is formed as a molding roller that is configured to press the optical fiber against the surface of the structural body and the bonding tool is configured such that it can move along the surface of the structural body with the molding roller rotating, wherein the heater is mounted close to the molding roller on an opposite side from the molding roller with respect to the optical fiber so as to be able to melt the thermoplastic resin at least in a portion in contact with the surface of the structural body by heating a surface of the optical fiber opposite to a surface in contact with the molding roller close to the molding roller , the bonding tool being characterised in that the optical fiber feeding section includes an optical fiber winding roller around which the optical fiber is to be wound and from which it can be unwound in operation, and a pair of opposed optical fiber feeding rollers , wherein the optical fiber winding roller , the optical fiber feeding rollers , and the molding roller are configured to be rotated to unwind the optical fiber from the optical fiber winding roller and convey it to the heater and the molding roller through the optical fiber feeding rollers , and wherein the optical feeding section is accommodated in the casing . <EOS>