Purpose: This study is intended to identify relationship between stress, depression and suicidal ideation in nursing students. Method: The subjects were 213 nursing students in B city. Data was collected from November 1, 2007 to November, 12, 2007 using structured questionnaire surveys and convenience sampling. Measuring instruments collecting data were SSI (scale for suicidal ideation) developed by Beck (1979), BDI (Beck depression inventory) translated by Lee (2001), scale for stress developed by Lee (2001). Collected data was analyzed by frequency, percentage, mean, standard deviation, t-test, ANOVA, Pearson correlation coefficients with SPSS/PC 12.0. Result: 1. Mean value of stress (50.69) of nursing students were moderate level, depression (28.06) was high, suicidal ideation was moderate. 2. Relationship of stress, depression, suicidal ideation of nursing students. 3. Stress of nursing students with positive relationship with depression (r=.60 p<.001) and suicidal ideation (r=.27 pp<.001). Depression of nursing students was positive relationship with suicidal ideation (r=.46 p<.001). Conclusion: Stress of nursing students was inclined to increase depression, suicidal ideation. Therefore, development of counseling and guidance program to decrease stress of nursing students is recommended.