Unique sound masking devices for toilets can be used in women’s restrooms in Japan. Such devices function to produce the sound of flushing water without actual flushing. To mask the sound of bodily functions, women tended to flush the toilet continuously while using it, thereby wasting a large amount of water. In the circumstances, sound masking devices have been introduced to public toilets. We have recently conducted a questionnaire survey to clarify the attitude of people toward such sound masking devices for toilets. The results of the survey showed that many Japanese women know such devices and often use them, that foreign women currently living in Japan also know that such devices exist, and that some Japanese men have heard of such devices but never used them. Many Japanese women are quite embarrassed at the thought that someone else can hear them while they are on the toilet. Many noted the necessity of such devices and required a wide range of setting for toilets in public spaces. However, they are not satisfied with the sound quality of the playback toilet flush sounds of currently available devices. The above results suggest that the sound quality of such devices should be improved.