Workplace violence (WPV) in healthcare settings has drawn attention for over 20 years, yet few studies have investigated the association between WPV and psychological consequences. Here, we used a cross-sectional design to investigate (1) the 12-month prevalence of workplace violence (WPV), (2) the characteristics of WPV, and (3) the relationship between WPV and burnout/secondary traumatic stress among 599 mental healthcare nurses (including assistant nurses) from eight hospitals. Over 40% of the respondents had experienced WPV within the past 12 months. A multivariate logistic regression analysis indicated that occupation and burnout were each significantly related to WPV. Secondary traumatic stress was not related to WPV. Our results suggest that WPV may be a long-lasting and/or cumulative stressor rather than a brief, extreme horror experience and may reflect specific characteristics of psychological effects in psychiatric wards. A longitudinal study measuring the severity and frequency of WPV, work-and non-work-related stressors, risk factors, and protective factors is needed, as is the development of a program that helps reduce the psychological burden of mental healthcare nurses due to WPV. healthcare settings occurs in psychiatric departments, emergency services, polyclinics/waiting rooms, and geriatric units [8].According to a review of WPV in psychiatric wards over the past 20 years, studies of WPV have examined mainly its occurrence rate, risk assessment, and risk management; fewer investigations have assessed the physical and psychological consequences of WPV [2]. WPV may cause not only physical injuries but also psychological impacts, resulting in higher rates of fear or anxiety, anger, insecurity, depression, emotional exhaustion, suicidal thoughts, post-traumatic stress symptoms, guilt, self-blame, and shame [2,8]. The consequences of WPV include decreased job satisfaction, increased intent to leave the organization, and lowered health-related quality of life [2].WPV and its consequences among nurses in Japan have been described [10,[16][17][18][19][20]. Of respondents to previous surveys, 33-47% of the nurses had experienced WPV during the prior 12 months [16][17][18]. The proportion of nurses who experienced physical aggression and verbal abuse was significantly high in psychiatric wards [16]. Another study showed that nurses who had encountered verbal abuse or violence by patients in psychiatry departments had experienced severe psychological impacts such as secondary traumatic stress and low satisfaction with family support [10]. The characteristics of WPV itself in Japan have been evaluated, but few studies have examined the psychological effects of WPV in detail.Burnout is defined as a syndrome conceptualized as resulting from chronic workplace stress that has not been successfully managed [21]. It is characterized by three dimensions: feelings of energy depletion or exhaustion; increased mental distance from one's job or feelings of negativism or cynicism related to one's job; and reduced pro...