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Background: Dupuytren's disease (DD) is well known as a fibromatous disorder of the palmar aponeurosis. Although there is a large body of literature on the etiology of DD in Europe, there have been few studies in Japan. The purpose of our study was to investigate the etiology and risk factors of DD in a large population in Japan. Methods: The subjects were voluntary participants from the 2014 Health Promotion Project, and 1,112 individuals were included (421 men and 691 women; mean age = 54.2 ± 15.3 years) in this study. The severity of DD was assessed using the Meyerding classification. All participants completed a questionnaire on age, sex, lifestyle, and occupations. All participants also completed the Short Form Health Survey (SF-36) to investigate the QOL. Fasting venous blood specimens were taken for biochemical analysis. Results: DD was found in 44 participants (3.9%). The prevalence was 8.3% among the men and 1.3% among the women. The prevalence in these older than 60 years was 7.7% (men; 18.5%, women; 2.4%). There were 17 participants that had DD of both hands. Multiple digits were affected in 9 participants. The ring finger was the most affected finger (71.2%), followed by the little finger (16.4%), and middle finger (12.3%). In Meyerding classification, 39 cases were stage 0, one case was stage 1, and four cases were stage 2. The multivariate logistic regression analysis revealed that age, sex, smoking, and occupation were significantly associated with DD. There was no significant association between DD and other parameters. When associations between DD and the SF-36 subscales were analyzed, there were significant associations with physical functioning, physical role functioning, and mental health. Conclusions: Our study is the largest in Japan to date. These results will provide very useful data to aid understanding of DD. [ABSTRACT FROM AUTHOR]