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Objective: Suicide is the leading cause of mortality in Japanese university students.This is the first study to evaluate prevalence and correlates of suicidal ideation, suicide behaviour, and exposure to suicide, depression, and alcohol dependence in Japanese university students.Methods: A total of 563 students (male: 289, female: 274, mean age: 19.95 years, SD=±1.27) from 3 private universities in Tokyo were surveyed anonymously.The questionnaires that authors developed were used to assess suicidal ideation, suicide behaviour, and exposure to suicide.The Zungs self-rating depression scale and CAGE questionnaire were used to assess depression and alcohol dependence, respectively.Results: Overall, 33.4% (n=188) of students had experienced suicidal ideation.In terms of suicide behaviour, 12.3% (n=69) and 5.5% (n=31) of those had experienced self-injury and suicide attempt, respectively.And 24.5% (n=138) of students reported they had been confronted with suicide others within their personal environment.The experience of suicidal ideation or exposure to suicide were significantly correlated with self-injury (r=.19, p<.001; r=.21, p<.001 respectively) or suicide attempt (r=.33, p<.001; r=.31, p<.001 respectively).The SDS and CAGE mean score were 44.18±7.55, 0.66±0.97, respectively.In terms of depression and alcohol related problems, 73.4% (n=413) of students met criteria of depression (40≤ on the SDS) and 40.9% (n=230) of those possibly had alcohol related problems (1≤ on the CAGE).Elevated levels of depression were significantly associated with the experiences of suicidal ideation (t(561)=6.93, p<.001), self-injury (t(561)=6.95, p<.001), suicide attempt (t(32)=3.50, p<.01), and exposure to suicide (t(561)=3.08, p<.01).The experiences of suicidal ideation (t(332)=2.13, p<.05)or exposure to suicide (t(561)=2.88, p<.01) were significantly associated with alcohol related problems.Conclusion: This study suggests that the prevalence of issues associated with suicide, depression, and alcohol related problems are common in Japanese university students.Findings highlight the importance of assessing suicidal ideation and exposure to suicide as well as suicide behaviour.