This study applies main Lean Manufacturing (LM) techniques to investigate the accordance of an auto parts manufacturer from Iranian automotive industry. Although the concept of LM has been successfully applied in previous studies, concurrent investigation of its requirements is less examined, especially in developing countries. In addition, the majority of previous studies have applied qualitative leanness assessment tools to investigate LM implementation while it is necessary to focus on both qualitative and quantitate techniques. In this regard, this study has applied seven wastes of LM, Value Stream Mapping (VSM) and Overall Equipment Effectiveness (OEE) to investigate the accordance of an auto parts manufacture with LM requirements. According to the obtained results, this manufacturer is moderately in accordance with LM philosophy.