An electronic device includes a semiconductor module, a wiring substrate, a case member and a heat conducting member. The heat conducting member thermally connects predetermined portions of wiring patterns and a heat conducting pattern of the wiring substrate to a predetermined heat conduction region of a surface of the case member opposing to the wiring substrate. The predetermined heat conduction region is located further from the wiring substrate than a surface of a body portion opposing to the case member. As a result, heat can be radiated and a short can be restricted with the case member having a simple shape. The heat conducting pattern is disposed adjacent to at least one of non-terminal projecting surfaces of the body portion on a surface of the wiring substrate. As a result, an area of a heat conducting passage increases and heat radiation performance can be increased.