A driver feels discrepancy between the actual measured aerodynamic noise generated from anautomobile door mirror and own impression. In order to clarify the mechanism of the gap on the senseof the noise, we estimated quantitatively the influence of assembly quality of the door mirror on theaerodynamic noise in the wind tunnel experiment. The aerodynamic noise of the door mirror isanalyzed based on Curle’s equation using the characteristics of the wake structure. The clearancebetween the panel of the body and base of the door mirror affects the noise level in the high frequencydomain, whereas the clearance between the base and visor influences the noise level in the lowfrequency domain. We analyzed the mechanism of the aerodynamic noise as the noise level becomeslarge due to the increase of the wake width when the clearance between the base and visor is increased.
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