PROBLEM TO BE SOLVED: To provide a new technology for acquiring brain activity information of a cerebral cortex of a living body. SOLUTION: A cortical brain wave electrode in which a plurality of electrodes that can be installed at a plurality of positions in the cerebral cortex are arranged on a deformable substrate is provided with a connector having a plurality of connection terminals electrically connected to a plurality of wirings. The first connector part, the base part is connected to the first connector part, the one or more electrode parts extending in the first direction, and the base part is connected to the first connector part and the wiring part extending in the first direction, An electrode part for lower temporal lobe extending in a second direction intersecting with the first direction, a ground electrode part for connecting the base part to the first connector part and connecting to a ground potential, and a base part connected to the first connector part A reference electrode portion for detecting a reference signal, and at least one end portion of the one or more electrode portions extends in the second direction and is adjacent to the electrode arranged in the temporal lobe lower electrode portion. A temporal lobe upper part electrode portion including an electrode that can be arranged is provided. [Selection diagram] Figure 1
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