Disclosed are an electronic control apparatus for a vehicle and provides an electronic control apparatus for a vehicle using a radiation board in which a radiation plate having a slide fixing structure (for example, “U” shaped) is attached onto a portion opposite to a portion which requires the radiation in a printed circuit board (PCB) and if additional radiation performance is required, a slidable radiation board which is detachable is attached/detached to directly emit heat to the atmosphere through the radiation plate and the radiation board to the atmosphere, thereby improving a radiation effect and to implement a standard platform of the radiation structure and implement an optimal radiation structure through a slidable radiation board and a manufacturing method thereof.