Electronic substrate device

An electronic substrate device, comprising:

• a heat conductive base member, which is fixed to an installation portion through an intermediation of attachment parts;
• a cover member, which is fixed to an outline peripheral portion formed so as to surround an outer peripheral edge portion of the base member;
• an electronic substrate, which is placed in an interior space between the base member and the cover member, and comprises a penetrating portion penetrating through a front surface portion facing with the cover member into a rear surface portion facing with the base member;
• and
• a heat generating component, which is mounted on the electronic substrate, and comprises a plurality of connecting terminals which are electrically connected, by soldering, to the electronic substrate, and comprises a die pad serving as a heat transfer member, a heat generating element attached to the die pad, and the front surface portion of the electronic substrate,
• wherein the base member comprises a central protruding portion, which is accommodated in the penetrating portion while facing with the die pad through an intermediation of a first gap, and first separated protruding portions, which are provided around the central protruding portion, and have a height dimension smaller than that of the central protruding portion, the first separated protruding portions having a top surface, which abuts the rear surface portion of the electronic substrate to form a second gap, and
• wherein a first heat transfer bond, which is a heat conductive adhesive, is applied to the first gap and the second gap communicating with the first gap.