The aim of this study was to clarify the impact of thickness of Pd/Cu membrane on the characteristics of biogas dry reforming (BDR) using Ni/Cr/Ru catalyst. In addition, this study also clarified the impact of reaction temperature, the molar ratio of CH4:CO2, the differential pressure between the reaction chamber and the sweep chamber, and the introduction of a sweep gas on the characteristics of BDR reactor using Pd/Cu membrane and Ni/Cr/Ru catalyst. As a result, this study revealed that the concentration of H2 in the reaction chamber and that in the sweep chamber increased with the increase in the reaction temperature. In addition, this study revealed that the highest concentration of H2 in the reaction chamber and that in the sweep chamber were obtained for the molar ratio of CH4:CO2 = 1.5:1. This study also clarified that the highest concentration of H2 was obtained for the thickness of 40 m, the molar ratio of CH4:CO2 = 1.5:1 and the differential pressure between the reaction chamber and the sweep chamber of 0 MPa without a sweep gas, which was 4890 ppmV in the reaction chamber and 38 ppmV in the sweep chamber, respectively. Under this condition, CH4 conversion, H2 yield and thermal efficiency were 75.0 %, 0.214 % and 2.92 %, respectively.