A method of producing a contact structure for establishing electrical connection with contact targets. The contact structure is formed of a contact substrate and a plurality of contactors. The contactor is uniformly formed of conductive material and has an intermediate portion which is inserted in the through hole provided on the contact substrate in a vertical direction, a contact portion which is connected to the intermediate portion and positioned at one end of the contactor to function as a contact point for electrical connection with a contact target, and a base portion which is provided at other end of the contactor, and a spring portion which is substantially straight and upwardly inclined relative to the surface of the contact substrate and provided between the base portion and the intermediate portion.