A controller mounted in a construction machine such as a dump truck includes a case having an upper surface provided with a plurality of heat release fins and a connector receiver hole for receiving a receptacle connector. The heat release fin includes a first heat release fin and a second heat release fin that are provided mutually crosswise to define an intersection. A first connector disposition face including a corner defined by the intersection and facing an edge of the upper surface is provided on the upper surface. A height of the receptacle connector disposed on the first connector disposition face is lower than a height of the first heat release fin and the second heat release fin.