During surgery, the patient is positioned optimally according to the type of operation. Careful attention is required because damage associated with patient positioning may occur during the course of the surgery. Here, we present a case of hyperextension neck injury observed following parotidectomy. A 68-year-old man who was diagnosed with a parotid tumor underwent an elective right partial superficial parotidectomy. After surgery, the patient was not able to move his upper and lower extremities and experienced voiding difficulty. Cervical magnetic resonance imaging showed spinal cord injury at the C3-4 and C5-6 levels. High-dose steroid treatment was started, and emergency laminoplasty C4-5 to C5-6 was performed. Following laminoplasty, motor function was almost fully recovered, but proprioception was weak, and voiding difficulty remained a problem. The patient received rehabilitation treatment in the hospital for about 3 months, demonstrating improvement. He was discharged and continued treatment in the outpatient department.