In this paper, the authors discussed about detection of passive path selfish node in mobile network. Earlier techniques for detection were based on statistical or signature. These techniques were useful for identifying the selfish nodes in active path only. But in this paper, distributed agent based technique is proposed for identifying passive path selfish nodes. Agents based technique is designed for gathering the information from various nodes. Every node is like a monitoring module and its task is to check the neighboring nodes, to observe their behavior and then to check out whether the node is selfish or not.