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A primary criterion of designing wireless sensor networks is energy efficiency. Focused on the energy problem of routing protocol in wireless sensor networks, we must mention to the clustering routing protocol. LEACH is one of the first clustering routing algorithms for sensor networks, and it is able to increase the network lifetime. However, it selects a cluster head based on random probability model and doesn't consider the distribution and the remaining energy of sensor nodes. This paper proposes eNergy-Efficient Cluster Head Selection (NECHS) mechanism base on fuzzy logic in clustering routing. By using fuzzy logic technique, appropriate cluster head is selected based on two factors: neighbor nodes and remaining energy. Simulation results show that the NECHS protocol achieves about 0.09 to 26.8% improvement when the rounds of first dead, tenth dead, half dead and all dead compared to the LEACH protocol.