MPCB (Molded Printed Circuit Board) is a PWB (Printed Wiring Board) with injection molding. MPCB will combine the PWB with structural parts such as cases and reinforcements for various purpose. The purpose of this study is to investigate the suitability of MPCB for automotive electronics through pilot production. As a result, MPCB has enabled simple assembly and space-saving. The prototypes have proved themselves to be superior to the conventional models in the basic performance and reliability. The study indicates that MPCB is new effective method to embody efficient hardware in automotive units and therefore this technology can innovate and diffuse in the automotive unit-assembly.