We presented a 64-year-old man who complained sudden onset of ulnar sided wrist pain, paresthesia in ulnar aspect of left hand after swinging a golf club. The intermittent pain was not relieved by physical therapy, local injection and medication on local clinics. Physical examination revealed tenderness on the area of the hook of hamate and weakness on flexion of 5th finger in the left side. Plane X-ray and electrodiagnostic study did not show abnormal findings. Bone scan revealed increased uptake localized on left ulnar site of wrist joint. For proper diagnosis, MRI and carpal tunnel view of left wrist were performed and fracture of the hook of hamate was found. We reported a case of non-union of golf related fracture of the hook of hamate by delayed diagnosis with the review of literatures.