Mesenchymal stem cells are frequently utilized in the study of regenerative medicine. Electric fields (EFs) influence many biological processes, such as cell proliferation, migration and differentiation. In the present study, a novel device capable of delivering a direct current of EF stimulation to cells cultured in vitrois described. This bioreactor was customized to simultaneously apply a direct-current EF to six individual cell culture wells, which reduces the amount of experimental time and minimizes cost. In testing the device, adipose-derived mesenchymal stem cells stimulated with an EF in the bioreactor exhibited a greater cell proliferation rate while retaining stemness. The results provide a unique perspective on adipose-derived mesenchymal stem cell proliferation, which is needed for tissue engineering and regenerative medicine.