The electrocorticographic electrode includes a first connector unit including a connector, the connector having a plurality of connection terminals electrically connectable to the plurality of wirings； one or more electrode units extending in a first direction and having a base connected to the first connector unit； an electrode unit for inferior division of temporal lobe extending in a second direction intersecting the first direction via a wiring unit, the wiring unit extending in the first direction and having a base connected to the first connector unit； a ground electrode unit connectable to ground potential and having a base connected to the first connector unit； and a reference electrode unit detectable a reference signal and having a base connected to the first connector unit, wherein an electrode unit for superior division of temporal lobe is provided on at least one end of the one or more electrode units, the electrode unit for superior division of temporal lobe extending in the second direction and including an electrode that can be placed in proximity to an electrode arranged in the electrode unit for inferior division of temporal lobe.
