The object is to provide a wire harness installation structure which can enhance an operation efficiency when installing a wire harness and can also achieve a space-saving design of an installation region. In the wire harness installation structure in which a wire harness 10 formed by bundling a plurality of wires 42 into a generally-circular form in a cross-sectional view is installed, the wire harness 10 has a flat portion 10a which is formed by thinning and flattening part thereof along an extending direction thereof and is kept in a flat shape, and by doing so, the installing operation is easy, and the installation region is made space-saving.
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