A questionnaire survey and rating experiments of the sound quality of exhausted noises admitted from motorcycles were carried out to clarify differences in attitude to these sounds between riders and non-riders. Riders were those who usually rode motorcycles and non-riders did not. Riders preferred idling sounds with strong low frequency energy and loud exhausted noises with strong high frequency energy that resulted from high speed riding. The subjective evaluation of riders was affcted by the motorcycle imagery associated with the sounds. However, non-riders did not show such trends. Non-riders essentially hated all kinds of motorcycle exhaust noise. They hated the sounds more strongly when the sound volume was larger. The onomatopoeic representations of an ideal motorcycle exhaust noise for riders were similar to those of an uncomfortable motorcycle noise for non-riders.