Patent ID: 8908380

Claim:
An electrical control unit comprising: a first member having a sealing groove on a first contact surface thereof; a second member having a protrusion on a second contact surface thereof, the protrusion being put in the groove of the first member when the second member is properly put on the first member to define therebetween a board receiving space; a printed wiring board received in the board receiving space, the printed wiring board having an electronic part mounted thereon; a sealing material received in the groove, the sealing material being pushed away from the move to a space between the first and second contact surfaces for bonding the first and second contact surfaces when the protrusion is inserted into the groove while pressing the sealing material, wherein the groove comprises inner and outer side walls that are connected through a rounded bottom wall, a height of the inner side wall being smaller than that of the outer side wall, and wherein a peripheral edge portion of the printed wiring board is put on a top of the inner side wall in a manner to serve as an extra part of the inner side wall; a fifth space provided between an upper surface of the printed wiring board and the second contact surface of the second member; and a second space provided between the top of the outer side wall of the first member and the second contact surface of the second member, wherein when the protrusion of the second member is inserted into the groove while pressing away the sealing material in the groove, the pushed away sealing material is forced to fill the fifth and second spaces, in which elastic members are resiliently put between the second contact surface of the second member and the peripheral portion of the upper surface of the printed wiring board.