Background: nursing students' attachment style can be used as a guideline for their mental health status and it is a component that influences individual performances thus improve nurse-patient relationship and patient outcome. A preliminary study conducted in 16 nursing students in a private school of nursing found that attachment style effects nursing students learning behavior. Aim: to indentify secure, insecure (fearful, preoccupied, dan avoidant) attachment style of nursing student. Reseach method: the method used in this study was a descriptive quantitative method. The population of the reseach was 1.094 people. Accidental sampling technique was used obtaining 207 peopla. Researchers used the Indonesian translated version of attachment style questionnaire (ASQ) that was re-tested for its vaidity and reliability (Cronbach α = 0.49 - 0.77). Result: 136 students (63%) had an insecure attachment style: 21% fearful. 20% preoccupied, and 26% dismissing. Recommendation: further study is expected to explore how attachment style affect nurse-patient therapeutic relationship.