Patent ID: 7434460

Claim:
A sealing structure comprising: a casing portion that includes a resinous member; an electric circuit that includes a substrate, which is supported using the resinous member in the casing portion; a radiation member that is at least partially embedded in the resinous member, the radiation member radiating heat emitted from the electric circuit to an outside of the casing portion; and a sealing member that seals the electric circuit in the casing portion, wherein the radiation member includes a heat receiving portion, an exposed portion, and a connecting portion, the connecting portion connecting the heat receiving portion with the exposed portion, the heat receiving portion receives the heat of the electric circuit, the heat receiving portion is covered with the substrate and the resinous member, the connecting portion is covered with the resinous member, the exposed portion is out of the resinous member and is exposed to an outside of the casing portion, the substrate includes a first surface portion and a second surface portion, the first surface portion covers the heat receiving portion of the radiation member together with the resinous member, the second surface portion is provided on an outer peripheral side of the first surface portion, the second surface portion makes contact with the resinous member, the first surface portion and the heat receiving portion have a first contact boundary therebetween, the second surface portion and the resinous member have a second contact boundary therebetween, the second contact boundary surrounds the first contact boundary, and the second contact boundary is sealed.