Faba bean necrotic yellows virus (FBNYV) causes severe yield losses and crop failure in fabaceous plants in western Asia and northern Africa. This virus belongs to Nanoviridae with a multipartite genome consisting of ten circular ssDNA components. FBNYV has been detected by TBIA method in chickpea and lentil in East Azerbaijan and West Azerbaijan, Qazvin, Kermanshah and Kordestan provinces. The main purpose of this research was detection and determination of certain molecular properties of FBNYV in central and western provinces of Iran. During a survey from 2008 to 2009 legume samples (chickpea, lentil, faba bean and common bean) showing yellowing, dwarfing and stem distortion were collected from Isfahan, Markazi, Chaharmahal-O-Bakhtiyari, Kermanshah, Kordestan and Lorestan provinces. The samples collected from Kermanshah, Kordestan and Lorestan provinces were tested by indirect-ELISA using a polyclonal antiserum. In indirect-ELISA seven out of 53 faba bean samples from Lorestan, six out of 56 chickpea samples from Kermanshah, three out of 18 chickpea samples from Kordestan and two out of six lentil samples from Kermanshah were tested positive. Total DNA was extracted from ELISA-positive samples and samples collected from Isfahan, Markazi and Chaharmahal-O-Bakhtiyari provinces. Nested-PCR was carried out using primers derived from the DNA-1 of Egyptian isolate of FBNYV. No visible band was detected in the first step of Nested-PCR reaction with DNA1F2/DNA1R2 primer pair. The expected PCR product (387 bp) was amplified in second step with DNA1F6/DNA1R4 primer pair in 17 out of 48 chickpea samples from Isfahan, four out of 22 common bean samples from Markazi and seven out of 12 common bean samples from Chaharmahal-O-Bakhtiyari. Eleven isolates representing different hosts and geographical regions including A5 and A13 (faba bean-Lorestan), D13 (chickpea-Kermanshah), M28 (lentil-Kermanshah), G10 (chickpea-Kordestan), SA4, SN9 and LN4 (chickpea-Isfahan), LG3 and LO4 (common bean Markazi) and SH5 (common bean-Chaharmahal-O-Bakhtiyari) were sequenced. The blast comparison revealed high similarity between nucleotide sequence of Iranian isolates and DNA1of Egyptian FBNYV isolate available at GenBank. Pairwise nucleotide sequence alignment of A5, A13, D13, G10, M28, SA4, SH5 and SN9 isolates with Egyptian and Syrian FBNYV isolates revealed 98/68, 98/55, 98/55, 97/39, 97/10, 96/23, 98/55, 97/39% and 74/68, 75/65, 75/65, 74/78, 74/49, 75/43, 75/65, 74/78% identity, respectively. These results show higher similarity between Iranian isolates and Egyptian isolate. Phylogenetic analysis confirmed closer relationship between Keywords : Faba bean necrotic yellows virus , Indirect ELISA, Nested-PCR