PROBLEM TO BE SOLVED: To provide a chair structure, having a structure that is easy to handle and capable of assisting transfer from a chair.SOLUTION: The chair structure equipped with a seat part 21 includes a chair main body (wheelchair) 6 including the seat part, support mechanisms 2, 3, 4, and 5 installed on the chair main body, and an extensible seat surface 1 supported by the support mechanisms. The support mechanisms are composed to be extensible from a storage position where the extensible seat surface is disposed under the seat part to a developed position where it is extended from a front end of the seat part forward.COPYRIGHT: (C)2011,JPO&INPIT【課題】いす構造において、取り扱いが容易な構造でいすからの移乗を補助する。【解決手段】本発明の座部21を備えたいす構造は、座部を含むいす本体(車いす)6と、該いす本体に取り付けられた支持機構2,3,4,5と、該支持機構に支持された拡張座面1とを有し、前記支持機構は、前記拡張座面を前記座部の下方に配置される収納位置から、前記座部の前端より前方へ延出する展開位置へと繰出可能に構成されていることを特徴とする。【選択図】図1