This investigation examined cases of suicide, suicidal attempts, and risk factors in 41 psychiatric hospitals of Aichi Prefecture.
 As a result,some characteristics of psychiatric wards considered to be effective in suicide prevention were shown. In addition, as for measures to resolve risk factors and the state of the patients, there were many which were effective in the prevention of suicide attempts. Regarding measures to reduce risk factors for symptoms and treat patients, there were many techniques which were effective in the prevention of suicidal attempts, but, for cases which did not respond to treatment, suicide was frequent.
 In addition, a “suicide preventive manual in a psychiatric hospital”produced based on these results was distributed.