PROBLEM TO BE SOLVED: To provide a chair for dental treatment, which prevents a patient from falling off in a footrest direction during a shift to a laid state from a raised state.SOLUTION: A chair 1 for dental treatment includes a contour seat 2 that has a seating surface 2a, and a backrest 3 that is attached to the contour seat 2 in such a manner as to be capable of being raised/laid. The chair 1 for dental treatment has a determination part for determining a state of the backrest 3, and the contour seat 2 has a stopper 2c that is protruded in such a manner that the amount of protrusion from the seating surface 2a can be changed depending on the result of determination made by the determination part.COPYRIGHT: (C)2016,JPO&INPIT【課題】起状態から倒状態への移行中に、患者がフットレスト方向にズレ落ちることがない歯科治療用椅子の提供。【解決手段】歯科治療用椅子1は、座面2aを有するコンターシート2と、該コンターシート2に対して起倒可能に取り付けられたバックレスト3とを備えるで。歯科治療用椅子1は、バックレスト3の状態を判定する判定部を有し、コンターシート2は、判定部での判定結果に応じて座面2aからの突出量が変化可能に突出するストッパ2cを有する。【選択図】図2