a photostimulation apparatus may include : a membrane for insertion into a living body ; and at least one cell disposed on the membrane . each cell may include a first light source for irradiating light to a photosensitive material in the living body . further , a photostimulation apparatus may include : a membrane for insertion into a living body ; and at least one first light source disposed on the membrane for irradiating light to a photosensitive material in the living body . since the photostimulation apparatus is placed on the surface of cortex or dura , it may minimize damage of the brain tissue and may activate and / or inhibit a large area simultaneously using light .