One thousand cases of resected gallbladders were histologically investigated by serial step sections. Intestinal metaplasia was found at rates of 4.0% and 30.6% in the cases without and with stone, respectively. It was found at rates of 69.8% and 61.1% in the cases of dysplasia and carcinoma, respectively. The goblet cells were found at rates of 34.5% and 26.3% in the lesions of carcinoma and dysplasia, respectively. On the other hand, the dysplasia and adenoma intermingled in the tumor tissue at the rates of 22.2% and 8.3% in 36 cases of carcinoma, respectively. Although normal epithelial cells of the gallbladder contain mainly sulfomucin, the goblet cells have sialomucin. The ratio of sialomucin-containing cells increased in the tissue of dysplasia and carcinoma. As to their location, intestinal metaplasia, dysplasia, and carcinoma showed a similar distribution in the gallbladder. Accordingly, it should be considered that the sequence of intestinal metaplasia-dysplasia-carcinoma is significant. Pseudo-pyloric glandular metaplasia was found at rates of 45.5% in the cases of cholecystitis without stone, 77.2% in those with stone, 100% in those with dysplasia, and 72.3% in those with carcinoma. However, it should be considered that pseudo-pyloric glandular metaplasia has less relationship for the bases of carcinogenesis as compared with intestinal metaplasia.