The purpose of our study was to determine the phaseolin types of common bean varieties widely consumed in Turkey through protein extraction. Twenty- four bean genotypes, consisting of 22 varieties from Korsehir province of Turkey and two control varieties (Andean and Mesoamerican) were assessed. Sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) was performed with protein samples extracted from bean genotypes. Gels were stained with Coomassie blue dye R-250 and kept in fixing solution. Our analyses revealed that out of 22 bean samples, 16 contained Andean phaseolin type and 6 contained Mesoamerican phaseolin type. T-test statistical analysis was performed to determine the relationship between seed phaseolin types and seed volumes (length, height and width). The results showed that there was a significant difference between phaseolin and seed volume.