As factors related to the preference of smell, this research took up and examined types and strength of smells and the behavior setting. Firstly, a questionnaire survey was conducted, followed by an evaluation experiment in which smells were actually presented. As a result of the questionnaire survey, it was found that smells of outdoor eating shops, natural phenomena, and natural construction materials are generally preferred. Moreover, it was found that preferences of smells are influenced by the behavior setting and the source of the smell. As a result of the experiment, it was confirmed that preferences were changed by the type of smell and the behavior settings. Smells occurring within a dark space tended to be accepted easily overall. Combined effects of types and strength of smells, and behavior setting on preferences were found.