PROBLEM TO BE SOLVED: To provide a contact sensor capable of improving durability in actual use, a seat for seating equipped with the contact sensor, and a wheelchair. A contact sensor is installed under a cushion member. The fulcrum mechanism 12 is installed on the plate-shaped member 11b and has a linear shape extending in the Y direction. The plate-shaped member 11a is installed on the fulcrum mechanism 12 so as to face the plate-shaped member 11b with the fulcrum mechanism 12 interposed therebetween, and the inclination with respect to the plate-shaped member 11b changes due to the seesaw structure having the fulcrum mechanism 12 as a fulcrum. .. The switch mechanism 13 is installed at one end 19a of the two ends 19a and 19b that are both ends of the plate-shaped members 11a and 11b sandwiching the fulcrum mechanism 12 in the X direction, and is in a contact state in an initial state, When the plate member 11a is inclined toward the end 19b by the seesaw structure, the plate member 11a is brought into a non-contact state. [Selection diagram] Figure 1【課題】実使用上の耐久性を高めることが可能な接触センサ、および当該接触センサを備えた着座用シート、車椅子を提供する。【解決手段】接触センサ１０は、クッション部材の下に設置される。支点機構１２は、板状部材１１ｂ上に設置され、Ｙ方向に延伸するライン状の形状を備える。板状部材１１ａは、支点機構１２上に、支点機構１２を挟んで板状部材１１ｂと対向するように設置され、支点機構１２を支点としたシーソー構造によって、板状部材１１ｂに対する傾きが変化する。スイッチ機構１３は、Ｘ方向において、支点機構１２を挟んだ板状部材１１ａ，１１ｂの両端となる２個の端１９ａ，１９ｂの内の一方の端１９ａに設置され、初期状態で接触状態となり、板状部材１１ａがシーソー構造によって端１９ｂ側に傾いた場合に非接触状態となる。【選択図】図１
