Introduction: The present study investigated the moderator role of job accident variable in relation to cognitive failure and meta-cognitive components. Method: This study is correlation. The participants of this study were 4726 male and female -formal and informal-personnel of car producing factory in 2007. At the long last, 254 persons were selected as the main studied participants. Cognitive Failure Questionnaire (CFQ) and Meta Cognition Questionnaire (MCQ) were the data collection instruments. Participants were divided into two groups of with accident and without accident, according the rate of accidents. In order to investigate the relationship between variables and comparing them, appropriate statistical descriptive procedure, correlation, independent T-Test and factor analysis were used, Results: There was significant discrepancy between two groups in terms of cognitive failure and meta-cognitive components. Also the relationship between cognitive failures and meta-cognitive components was significant in two groups. Conclusion: Cognitive failure in the morning class (individuals who have the maximum level of consciousness and awareness in the morning) is higher than evening class (individuals who have the maximum level of consciousness and awareness in the evening). Taking this point into account, applying the evening class individuals in jobs that have shifts and night shift can prevent the accident.