PROBLEM TO BE SOLVED: To allow a patient to have a moderate posture when the patient is lying on his/her back to receive a medical examination on an examination chair.SOLUTION: A mechanism for tilting head and back parts of a patient includes: a geared motor 8 mounted on a headrest arm side 5 of a headrest 1 of the examination chair via a bracket 7 a left-and-right rotary drive support member 9 fixed on a cushion base seat 3 on the cushion side a rotary axis 10 along the longitudinal direction of the examination chair, fixed at the lower part of the left-and-right rotary drive support member 9 and a rotary axis 8a of the geared motor 8 connected to the rotary axis 10 to form a mechanism for tilting head and back parts of a patient. The head part of the patient is tilted to the side direction by rotating the headrest 1 by rotation of the geared motor 8.COPYRIGHT: (C)2011,JPO&INPIT【課題】診療椅子にて仰臥診療をする際に患者に無理のない体勢をとらせることである。【解決手段】頭背部傾斜機構は、診療椅子におけるヘッドレスト1のヘッドレストアーム5側に、ブラケット7を介してギアードモータ8を取り付け、一方、クッション側のクッション基台3に左右回転駆動支持部材9を固定し、左右回転駆動支持部材9の下部に診療椅子の縦方向に沿った回転軸10を固定し、この回転軸10にギアードモータ8の回転軸8aを連結して成り、ギアードモータ8の回転によりヘッドレスト1を回動させ患者の頭部を側方に傾斜させる。【選択図】図1