PROBLEM TO BE SOLVED: To provide a brain activity measuring electrode easily brought into contact with a scalp, while avoiding pressure of surrounding hair of the head, a head-worn device using the electrode, and a brain activity measuring system.SOLUTION: A third disk 9 including a curved surface 9a as a scalp contact part coming into contact with the scalp is supported by a column 6 that supports the third disk 9 and has a smaller cross-sectional area than a cross-sectional area of the third disk 9. A head hair storage area S1 for storing hair of the head is configured at an area in an opposite side of the head hair, with the third disk 9 interposed therebetween, and the periphery of the column 6. When the brain activity measuring electrode is installed on the head part, this configuration can reliably bring the electrode into contact with the scalp while avoiding pressure of the periphery of the electrode.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2018,JPO&INPIT【課題】周囲の頭髪の圧力を避けて頭皮に当接させることが容易な脳活動計測用電極、そのような電極を使用した頭部装着装置及び脳活動計測システムを提供すること。【解決手段】頭皮に当接する頭皮接地部としての曲面部9aを備えた第3の円板9を、第3の円板9を支持し第3の円板9の横断面積よりも小さな横断面積となる支柱6によって支持する。第3の円板9を挟んで頭皮と反対側の領域であって支柱6の周囲には頭髪を収容するための頭髪収容領域S1を構成する。これによって脳活動計測用電極の頭部装着時に電極周囲の圧力を避けて電極を頭皮に確実に当接させることができることとなる。【選択図】図2
