© 2020 Asian AOMS(+) ASOMP(+) JSOP(+) JSOMS(+) JSOM(+) and JAMI Chondrosarcoma is accounts for some 10 % of osteogenic malignant tumors, its development from a jawbone is very rare. We have experienced a patient with chondrosarcoma developing in the condyler head as reported below. The patient was a 42-year-old man. elastic hard swelling was observed in a location corresponding to the left condyler head. Radiographically, a neoplastic lesion was detected in the left head of mandible with no bone destruction in the skull base. Histopathological examination was performed under general anesthesia. Based on the diagnosis of suspected condyler head chondrosarcoma, tumor resection,left supraomohyoid neck dissection and reconstruction with an anterolateral thigh flap were performed under general anesthesia of the next month. A histopathologycal observation of removed tissue samples confirmed chondrosa-rcoma. No abnormality such as tumor recurrence has been found for seven years postope-ratively.