Adult rhabdomyoma is a rare neoplasm of mesenchymal origin which represents approximately 2% of tumors with skeletal muscle differentiation. There are only about 100 cases reported in the literature. It is a benign tumor occurring most frequently in the head and neck region, which affects predominantly male population of a mean age ranging from 54 to 60. The purpose of this article is to present a new case of adult rhabdomyoma located in the masticatory area, arising as a slow-growing mass bulging in the left-side jugal mucosa and temporal region. The most common location for adult rhabdomyoma is the pharyngeal cavity. This type of tumor appears as a solitary mass, though occasionally may be multifocal. This tumor being of low occurrence, correct diagnosis can prevent aggressive surgery.