OBJECTIVE: The purpose of this study was to examine the relationship between suicidal ideation and the associated with sociodemographic and clinical factors in community dwelling, elderly living alone in Korea. METHODS: A total of the 329 community-dwelling elderly aged 65 years or older who lived alone were recruited and they underwent the questionnaire including their sociodemographic data, Activities of Daily Living/Instrumental Activities of Daily Living scale (ADL/IADL) and the Korean version of the Short Geriatric Depression Scale (SGDS-K). Suicidal ideation was evaluated by using the "suicidal thought" item of the Beck Depression Inventory (BDI). RESULTS: According to the result of our sample of elderly living alone, 22.8% of the subjects reported their suicidal ideation. ADL/IADL score (p<0.01), subjective economic status (p<0.05), and subjective health status (p<0.05) had a negative correlation with suicidal ideation. SGDS-K score (p<0.05) had positive correlations with suicidal ideation. Multiple regression analysis revealed that suicidal ideation correlates to ADL/IADL score (p=0.025). CONCLUSION: This study exhibit that ADL/IADL is significantly associated with suicidal ideation.