We report a case of multicystic gallbladder carcinoma in a 47 years old male, who had no abdominal discomfort and showed no abnormal laboratory test except for mild elevation of leukocyte and C reactive protein. On computed tomography and magnetic resonance imaging. the gallbladder wall was multicystically thickened and its cavity was narrow. The mucosal line was not disrupted. On gross appearance, there were multiple cysts containing mucus in thickened gallbladder wall. The tumor was pathologically diagnosed as the gallbladder carcinoma with two histological types including mucinous cystadenocarcinoma and tubular adenocarcinoma.