The present disclosure relates to an electronic control apparatus for a vehicle, and the electronic control apparatus of the present disclosure includes: an electronic control element which includes a printed circuit board (PCB) and electronic components installed on a surface of the PCB; a cover and a base which accommodate the electronic control element; and a connector which is coupled to the electronic control element, wherein a front end portion having a protrusion is formed at an edge of the cover so that the PCB is inserted and mounted between the protrusion of the cover and an edge of the base, a projection portion is formed at a rear end portion of the edge of the base where the cover and the base come into contact with each other, and the cover and the projection portion of the base come into contact with each other so as to form a predetermined space between the front end portion and the rear end portion so that a sealing member is inserted into the predetermined space.