PROBLEM TO BE SOLVED: To provide a dental treatment chair that enables a position of a patient's head to be effectively changed by changing a position of the patient's back or buttocks.SOLUTION: A dental treatment chair 1 includes a backrest 4 and a contour seat 3, and has bag bodies 3a and 4a provided in at least one of the backrest and the contour seat. The dental treatment chair 1 comprises a headrest 5 on which a plurality of pressure sensors 7 for measuring pressure generated by a patient's head are laid, and a pressure control part 9 for controlling internal pressure of the bag body on the basis of the result of measurement performed by the pressure sensor.
