An object of the present invention is to provide electron emission devices having improved electron convergence. To this end, an electron emission device of the present invention is such that a cathode electrode, an insulating layer, and a gate electrode are layered on a substrate in an order; an electron emission layer is in a first hole on the substrate penetrating from the gate electrode through the cathode electrode; an upper surface of the electron emission layer is between an upper surface of the substrate and a boundary between the cathode electrode and the insulating layer; at least one of a side surface and a lower surface except for a central area of the electron emission layer contacts the cathode electrode. By such an electron emission device, electrons are emitted mainly from the peripheral area of the electron emission layer. Accordingly, the electron convergence is improved.