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One of the most important allergens is pollen and a wide range of allergenic plants are in Leguminosae family. In this research, four fresh allergen pollen of this family including Melilotus officinalis (L.) Desr. (Yellow Sweet-Clover), Spartium junceum L. (Spanish broom), Robinia pseudoacacia L. (Black Locust) and Trifolium repens L. (White clover) were taken from nature of Kermanshah. The pollen grains were studied by Light Microscopy (LM) for all studied species. In addition, the pollen grains of S. junceum were studied by Scanning Electron Microscopy (SEM). Results showed that the pollen grains of these genera were isopolar, spheroidal or subprolate and prolate, medium-size, tricolporate, triangular polar view, oval equatorial view and with microtuberculate or microreticulate ornamentation. Therefore, the genera of Fabaceae had as very heterogeneous allergenic pollen grains.