A production method for producing a device connector in which one or more conductors to be connected to device-side terminals provided in a device are made integral by a molded resin portion comprising a primary molded portion and a secondary molded portion, comprising the following steps: molding a primary molded article in which the one or more conductors are made integral by a primary molded portion of synthetic resin; molding a secondary molded portion made of synthetic resin to integrally form the primary molded article and a metal plate to be attached and fixed to the device, wherein the secondary molded portion is formed by a secondary molding die including both first and second dies (90, 91) which are opened in a first direction and at least one slide die which is opened in a second direction intersecting the first direction; while tightly holding the slide die by means of a pair of tightly holding portions arranged to intersect with an injection direction, in which molding resin for forming the secondary molded portion is injected, and provided on the primary molded portion before the secondary molded portion is formed, the pair of tightly holding portions facing each other in the injection direction and standing upward; forming in the molded resin portion by the slide die at least one nut accommodating portion for at least partly accommodating a nut to be threadably engaged with a fastening bolt to be fastened to the conductor and at least one escaping recess communicating with the nut accommodating portion and adapted to allow the fastening bolt threadably engaged with and penetrating through the nut to escape, wherein the slide die includes a molding pin comprising a nut accommodating portion forming portion and an escaping recess forming portion narrower than the nut accommodating portion forming portion in a lateral direction, the escaping recess forming portion being tightly held from the lateral sides by the pair of tightly holding portions, wherein a fastening portion of the conductor to which the fastening bolt is to be fastened is formed at the upper end of the nut accommodating portion, wherein the escaping recess is formed with a bottom wall connecting the pair of tightly holding portions; and wherein the slide die is tightly held from upper and lower sides by the fastening portion of the conductor and the bottom wall, the up-down direction being parallel to the first direction. molding a primary molded article in which the one or more conductors are made integral by a primary molded portion of synthetic resin; molding a secondary molded portion made of synthetic resin to integrally form the primary molded article and a metal plate to be attached and fixed to the device, wherein the secondary molded portion is formed by a secondary molding die including both first and second dies (90, 91) which are opened in a first direction and at least one slide die which is opened in a second direction intersecting the first direction; while tightly holding the slide die by means of a pair of tightly holding portions arranged to intersect with an injection direction, in which molding resin for forming the secondary molded portion is injected, and provided on the primary molded portion before the secondary molded portion is formed, the pair of tightly holding portions facing each other in the injection direction and standing upward; forming in the molded resin portion by the slide die at least one nut accommodating portion for at least partly accommodating a nut to be threadably engaged with a fastening bolt to be fastened to the conductor and at least one escaping recess communicating with the nut accommodating portion and adapted to allow the fastening bolt threadably engaged with and penetrating through the nut to escape, wherein the slide die includes a molding pin comprising a nut accommodating portion forming portion and an escaping recess forming portion narrower than the nut accommodating portion forming portion in a lateral direction, the escaping recess forming portion being tightly held from the lateral sides by the pair of tightly holding portions, wherein a fastening portion of the conductor to which the fastening bolt is to be fastened is formed at the upper end of the nut accommodating portion, wherein the escaping recess is formed with a bottom wall connecting the pair of tightly holding portions; and wherein the slide die is tightly held from upper and lower sides by the fastening portion of the conductor and the bottom wall, the up-down direction being parallel to the first direction.