PROBLEM TO BE SOLVED: To provide a cuff for blood pressure information measurement instrument and a blood pressure information measurement instrument configured in a simplified manner and capable of applying a sufficient pressing force to a part to be measured.SOLUTION: A cuff for blood pressure information measurement instrument comprises: a belt-like cuff body and a fluid bag 23A which is attached to the cuff body, expandable/contractable with inflow/outflow of a fluid, and used wound around an object to be measured. The fluid bag 23A is made by flattening a cylindrical resin sheet and has a rectangular bag-like shape in which the openings in both end parts are sealed. Partially welded parts 79A, 79B, 81A, 81B where the resin sheet is folded and welded are formed in a part of at least one side of a pair of opposing sides 71, 73 crossing the sides of the sealed end parts and extending along a winding direction to the object to be measured.COPYRIGHT: (C)2014,JPO&INPIT【目的】簡便な構成で十分な圧迫力を被測定部位に作用させることができる血圧情報測定装置用カフ及び血圧情報測定装置を提供する。【解決手段】血圧情報測定用カフは、帯状のカフ本体、及びカフ本体に取り付けられ流体が入出することにより膨縮する流体袋23Aを有し、被検体に巻き付けて使用される。流体袋23Aは、筒状の樹脂シートを扁平とし、開口する両端部を密閉した方形の袋状に形成される。密閉された両端部の辺に交差して被検体への巻き付け方向に沿う一対の対向辺71,73のうち、少なくとも一方の対向辺の一部に、樹脂シートを折り重ねて溶着した部分溶着部79A,79B,81A,81Bを形成する。【選択図】図6