Electronic Control Unit

An object of the present invention is to provide an electronic control unit that curbs overflow of a sealant at a three-way junction of the sealant in the vicinity of a connector. The electronic control unit includes a first seal part that seals between a base member and a cover member a second seal part that seals between the base member and a connector housing and a third seal part that is connected to the first seal part and the second seal part and seals between the cover member and the connector housing In a part (three-way junction) where the first seal part the second seal part and the third seal part intersect, a space part JA that is connected to the recessed part and recessed further from a surface forming the recessed part is formed.