Actinomycosis of the central nervous system is rare. There has been considerable discussion as to whether it can be primary, but several cases have been reported occasionally. Authors presented a case of cerebral actinomycosis involving primarily the right frontal lobe through an obsolete stick wound. Patient is a 18-year-old man and when he was 8 years of age, he received right frontal penetrating injury due to fall on wire about 3 mm in diameter. Wound had healed sustaining any abnormal effect to note. Eleven years later, he was admitted to our institution because seizure attack characterized by automatism, and plain skull X-ray showed intracranial frontal calcification. EEG, angiography, RI scan and CT scan were performed. At operation, a granuloma was found and total removal was performed. The histological examination showed actinomycotic brain absess. Patient was treated with antibiotics and he returned to the previous occupation. Primary actinomycosis of the central nervous system was discussed with previously reported cases in the literature.