Vegetable soybean (Glycine max[L.]) is mainly consumed in Asian countries, but has recently attracted attention worldwide due to its high nutritional value. We aimed to identify the indigenous rhizobia of vegetable soybean in Yao City, Osaka Prefecture, Japan, and to clarify the relationships between the rhizobial community and soil environmental factors. Soil samples were collected from 12 vegetable soybean cultivation fields under two different conditions (six greenhouses and six open fields) in Yao City with different varieties of vegetable soybean. A total of 217 isolates were obtained from the nodules and clustered into nine operational taxonomic units (OTUs) with 97% homology based on the 16S-23S rRNA internal transcribed spacer (ITS) region. A phylogenetic ana­lysis showed that OTUs were closely related toBradyrhizobium liaoningense,B. ottawaense,B. elkanii, and otherBradyrhizobiumspecies and were dominant in this order.B. liaoningensewas widely found in sampled sites and accounted for 50.7% of all isolates, whileB. ottawaensewas mostly limited to open fields. This rhizobial community differed from Japanese soybean rhizobia, in whichB. diazoefficiens,B. japonicum, andB. elkaniiwere dominant. These results imply the characteristic differences among host plants or regional specialties. A non-metric multidimensional scaling (NMDS) ana­lysis revealed the significant impact of soil pH and the contents of Ca, Mg, Mn, total nitrogen (TN), and total carbon (TC) on the distribution of rhizobia.B. liaoningensewas detected in soils with a neutral pH, and high TN and low Mn contents increased its abundance. The present study provides novel insights into Japanese rhizobia and potentially novel resources for sustainable agriculture.