As it can lighten the unpleasant impression due to the noise which the dentistry remedy instrument gives out, headrest and the dentistry remedy chair which for the dentistry remedy chair can guarantee the communication of the doctor and the patient are offered. At the time of dentistry remedy, the occiput support component at the both ends of 91 which supports the occiput of the patient and occiput support component 91 the lug support component it possesses with 92 whose it is possible to be crooked, and 92 to the direction which covers the lug of the patient. Lug support component 92 and 92 or occiput support component 91, the sound output section has 93 which outputs the sound from the sound generator and 93, lug support component 92 and 92 has the collection sound section 94 which sound of around environment collection sound is done. The correspondence number which collection sound is done cuts the frequency which is larger than 8kHz due to acoustic filter 95 and 95 in collection sound section 94.歯科治療器具の発する騒音による不快感を軽減することができるとともに、医師と患者とのコミュニケーションを確保することができる歯科治療椅子用ヘッドレスト及び歯科治療椅子を提供する。歯科治療時に、患者の後頭部を支持する後頭部支持部材91と、後頭部支持部材91の両端にて患者の耳を覆う方向へ屈曲することが可能な耳支持部材92、92とを有する。耳支持部材92、92又は後頭部支持部材91は、音源からの音を出力する音出力部93、93を備え、耳支持部材92、92は、周囲環境の音を集音する集音部94を備える。集音部94で集音した音信号は、音響フィルタ95、95により8kHzより大きい周波数をカットする。
