To provide a method for manufacturing a control board inexpensively in a short period of time while enhancing workability sharply.

At first, a mounting plate 2 is arranged laterally such that a predetermined fixing surface 2a forming the inner side face of a control board turns upward. Subsequently, a work for fixing a DIN rail 8 and various apparatuses to the fixing surface 2a and required connection work are carried out under a state where the fixing surface 2a is arranged upward. Upon finishing the fixing work and connection work, the mounting plate 2 is erected and a cover 1 constituting the contour of the control board is fixed to the mounting plate 2.