The present invention relates to an electron emission device in which a high voltage can be properly applied to anode electrodes by improving a pattern of apertures of a grid electrode to reduce a diode emission. In an exemplary embodiment of the present invention, the electron emission device includes a first substrate and a second substrate facing each other and having a predetermined gap therebetween. An electron emission unit is formed on the first substrate, and a light emission unit formed on the second substrate. A grid electrode is mounted between the first and second substrates, and has a plurality of apertures per a sub-pixel region of the electron emission unit.