To provide a dental head rest effectively holding a cervical vertebra part of a patient to protect cervical vertebrae even in long-time treatment, naturally fitting a position of the head of the patient, and allowing the patient to safely have the treatment without imparting fatigue to the patient.

This head rest for a dental treatment chair includes: a frame member 10 supporting the head of the patient; and a cushion member 20 disposed on the frame member 10. The cushion member 20 comprises: a lower cushion member 21 disposed in a state that the lower cushion member 21 is extended to the neck of the patient from the frame member 10; and an upper cushion member 22 disposed in an upper part of the lower cushion member 21, and disposed in a position wherein the cervical vertebra part of the patient is supported.