Background: Medical errors are the most common errors in nursing students that threatening the health and increased mortality and hospital costs. On the other hand reporting rate the error is low. Therefore, this study aimed to investigate the occurrence and causes of not reporting medication errors in nursing students from their perspective. Methods: This cross - sectional analytic study performed on last term nursing students in Zahedan. In order to collect data used questionnaire contain demographic question and 17 items about reasons for not reporting medical errors (in three areas: fear of the consequences of reporting, management and reporting of the factors). Data analysis by descriptive statistics (mean and standard deviation) and t- test in Spss v.16 software. Results: Results showed that 58/1% of students who commit medical errors are the only 16/7% of them has reported their mistakes to the coach. Among the areas of highest rated areas is factor related to reporting (3/09 ± 0/99) was given, in which the forgetting medication error reporting by students accounted for most points (3/40 ± 1 / 26). Also, no significant difference was observed between student gender of medication errors and p = 0/57). Conclusion: Medication error is important in nursing students practical. Therefore, planning of program for medication errors reduction and control and records in nursing students is necessary.