<p>Intended is to improve a noise intrusion preventing function in an electronic device mounting structure interposed between electrically insulated metals. Provided is an ECU mounting structure (10) is constituted by mounting an ECU, which includes a box-shaped metallic base (13) having one face opened, an ECU substrate (11) housed in the metallic base (13) and a resin mold (12) covering the periphery of the ECU substrate (11), through a rubbery grommets (15) with the open face confronting a separate engine (17).This open face side is covered with a metallic shielding member (16) to contact the metallic base (13).</p>
