To provide a doctor chair capable of easily moving around the head of a patient and making an instrument holder move together with the movement of the doctor chair, and allowing a doctor to always take out a desired instrument from the instrument holder.

The doctor chair for dentistry consists of a support arm 12 horizontally extending from a base 11 of an odontotherapy chair 1 and the doctor chair 13 to rotate around a rotation support mechanism 14 for rotatably supporting the tip of the support arm 12. The center of rotation is located at the position of a headrest 8 when the odontotherapy chair 1 is in the state of a bed. The doctor chair 13 is rotatable with such a radius as the doctor can easily perform the odontotherapy around the headrest 8.