Case reports was made on five cases of granular cell ameloblastoma. Age of the patients ranged from 17 to 53 years and mean age was 31. One case was in male and four were females. All cases occurred in the mandible. Four lesions involved the mandibular body or the ascending ramus and one involved the symphyseal region. Radiographic examination revealed unilocular appearance in four cases. Only one case indicated multilocular type. Histologically many of the granular cells were restrictively shown in the stellate reticulum of the epithelial nests. Granular cells were suspected to change from the stellate cells. The granules were ultrastructurally similar to the lysosomes. Although the granular cells indicated various stages of breakdown, in which the granules were released extracellularly, the nuclei retained normal pattern. These findings rejected the possibility of degenerative change of the cells.