An electronic device mounting structure for fitting an ECU (2) (electronic device) in an open space (4) formed in a device mounting housing (1) and for holding the ECU fitted in the open space (4) by a holding finger (9) formed on the device mounting housing (1), includes a stopper (10) formed in the device mounting housing (1) so as to be juxtaposed with the holding finger (9), the stopper being configured to prevent the ECU (2) from falling out of the device mounting housing (1).
