A brain electrode apparatus is a brain electrode apparatus including an electrode that is capable of being inserted into a brain, and the brain electrode apparatus includes a long-shaped probe, an electrode part formed on the probe, and an inserting member that is detachably inserted in a first hole formed on a plane face of the probe having flexibility. Further, the probe includes a first area on the electrode part side with respect to the position where the first hole is formed, and a second area on the opposite side of the electrode part side with respect to the position where the first hole is formed, and the inserting member is inserted into the first hole in a state where the probe is bent at the position of the first hole such that the second area overlaps the first area.
