PROBLEM TO BE SOLVED: To provide an option receiver which can improve convenience. SOLUTION: This is an option receiver 41 for attaching an option to a bottom 11 of a body supporting device 10, and a pair of first parts 70 to which the option is fixed, and a second part for fixing the pair of first parts 70 to the bottom 11. 50, and the first component 70 includes a plate member 73 disposed on the bottom 11 and a frame member 75 extending upward from the plate member 73, and the second component 50 includes the inside of the opening 26d of the bottom 11. A first member 51 and a second member 52, which are part of the peripheral edge and are in contact with the first region 11a and the second region 11b, which face each other, are provided, and the first member 51 fixes the first component 70 to the bottom 11, The second member 52 is connected to the first member 51 and can be displaced relative to the first member 51. [Selection diagram] Fig. 5【課題】利便性を向上できるオプション受けを提供する。【解決手段】身体支持装置１０のボトム１１にオプションを取り付けるオプション受け４１であって、オプションが固定される一対の第１部品７０と、一対の第１部品７０をボトム１１に固定する第２部品５０と、を備え、第１部品７０は、ボトム１１上に配置される板材７３と、板材７３から上方に延びるフレーム材７５と、を備え、第２部品５０は、ボトム１１の開口２６ｄの内周縁の一部であり互いに向かい合う第１領域１１ａおよび第２領域１１ｂそれぞれに接触する第１部材５１および第２部材５２を備え、第１部材５１は、第１部品７０をボトム１１に固定し、第２部材５２は、第１部材５１に連結され、第１部材５１に対して相対的に変位できる。【選択図】図５
