An auxiliary device requiring waterproofing measures is disposed so as to ensure the waterproofness of the auxiliary device even in a region exposed to water with a minimal increase in the number of components. This automobile auxiliary device mounting structure is configured by comprising: an auxiliary device 20 having a metal housing 21 or female connectors 22 in a region exposed to water in an automobile with a retractable roof; a cover 30 which covers the auxiliary device 20, and which is formed with a plurality of panels 37 and hinges 38 so as to be upwardly bendable; and a harness support bracket 50 which supports a wire harness, and which is equipped with a restraining function that restrains the cover 30 from bending.
展开▼
