PROBLEM TO BE SOLVED: To provide a pressure sensor capable of clearly sensing a state with a sole attached to a floor and a state with the sole separate from the floor without depending upon individual difference in the size of a foot of a person wearing a walking aid device, an information processor, and an electrode determination method.SOLUTION: The pressure sensor includes an electrode sheet provided with a first electrode and a plurality of second electrodes, a pressure-sensitive sheet in which surface resistance is changed by pressure, is configured by overlapping one surface of the pressure-sensitive sheet on one surface of the electrode sheet, and is put on between a human sole and the ground. In the pressure sensor, the first electrode and the plurality of second electrodes are respectively provided at positions different from each other on the surfaces of the electrode sheet, and a conducting wire for being electrically connected to an information processor for measuring voltage corresponding to the resistance of an area including the surface of the pressure-sensitive sheet, the surface located between the first electrode and the second electrodes 2 in each of the second electrodes is extracted from the respective electrodes.COPYRIGHT: (C)2013,JPO&INPIT【課題】歩行補助装置の装着者の足のサイズの個人差に依存せず、足裏の着床と離床の状態を明確に感知することが可能な圧力センサ、情報処理装置、及び電極決定方法を提供する。【解決手段】本発明は、第1の電極と複数の第2の電極が設けられた電極シートと、圧力により面抵抗が変化する感圧シートと、を備え、前記感圧シートの一方の面と、前記電極シートの一方の面とが重なり合って構成され、人の足裏と地面との間に装着される圧力センサである。そして、この圧力センサにおいて、前記第1の電極と複数の第2の電極は、それぞれ前記電極シートの前記面上の互いに異なる位置に設けられ、且つ、前記感圧シートの前記面であって前記第1の電極と前記第2の電極との間に位置する前記面を含む領域の抵抗に応じた電圧を前記第2の電極ごとに測定する情報処理装置へ電気的に接続するための導線がそれぞれの前記電極から引き出されている。【選択図】図1
