A brain electrode (1) that can be inserted into the brain includes a planar base portion (10), an electrode portion (12) formed on the base portion (10), and a bending electrode extending from one end side of the base portion And a flexible bending portion (20) having the bending portion.脳内部に挿入可能な脳電極(1)は、平面状の基部(10)と、基部(10)に形成された電極部(12)と、基部(10)の一端側から延出し、曲面を有する柔軟な曲げ部(20)とを備える。