PROBLEM TO BE SOLVED: To provide an electrode needle which precisely measures in-vivo information and is less likely to cause a patient to feel a pain when the needle is inserted and when it is pulled out, a biological information measurement device using the electrode needle, and a liquid supply device.SOLUTION: The electrode needle (first electrode needle 1) is an electrode needle to be punctuated into a living body, and comprises a columnar or tubular core 1a an electrode (electrode layer 12) formed in the core 1a an insulation part 14 where the electrode is covered with insulating material and an electrode window part 15 where the electrode or a sensing layer (detection layer 17B) formed in the electrode is exposed.SELECTED DRAWING: Figure 5ACOPYRIGHT: (C)2017,JPO&INPIT【課題】高精度に生体内の情報を測定すると共に、針の挿入時および引抜時に患者に痛みを感じさせ難い電極針、電極針を用いた生体情報測定装置、及び液体供給装置を提供する。【解決手段】電極針(第1電極針1)は、生体内に穿刺される電極針であって、柱形状または管形状の芯部1aと、芯部1aに形成された電極(電極層12)と、電極が絶縁材料で覆われている絶縁部14と、電極または電極上に形成された感知層(検知層17B)が露出する電極窓部15と、を備える。【選択図】図5A
