This study was carried out to examine the correlationship among incidence, frequency, loudness, and the related predisposing factors about snoring through epidemiologic investigations. Questionaires were used for a clinic-visitor who is irrelevant to snoring, and investigated by sex, age, body mass index(below BMI), and occupation. The subjects were grouped by age; below twenties, twenties, thirties, forties, fifties, sixties, and over sixties. On using BMI, the subjects were divided into two groups; overweighed and non-overweighed group. And the occupation were simplified to two groups; physical labors and mental labors. An statistical analysis was perfomed about correlation to whether to snoring or not, its frequency, loudness and the related predisposing factors. The results were obtained as follows : 1. Snorers were commanded as 5.1% of all clinic-visitors. Male was dominant to female (p<0.01). The number of snorer was increased with age(p<0.05) and overweighed group showed higher incidence than in non-overweight group(p<0.01). 2. There was no significant difference between occupation groups in incidence of snoring. 3. In case of the frequency of snoring in snoring group, there was significant increase in male, overweighed and mental labors group(p<0.01). But, there was no difference with age. 4. In case of loudness of snoring in snoring group, male, overweihged and mental labors had louder noise than in other contrary group. But there was no difference with age. 5. For the related predisposing factors to snoring, fatigue was the highest(74.4%), and alcoho and drug were followed.