La0.9Sr0.1Ga0.8Mg0.2O3 (LSGM)-based honeycomb cell was first time successfully built and power generation property of the single-wall and the 4-wall-used cells was measured. The achieved maximum power density is 390 and 250mW/cm(2) at 1073 and 973K, respectively, when the single wall is used for the cell fabrication. The power generations of 4-wall-used cell also succeed in this study, and about 200mW/cm(2), which is high volumetric power density as high as 300 W/L, is achieved.