An electron beam emitting apparatus has a first plate with an electron-emitting device 15, and an electrode 8 opposed to the first plate, and the electrode 8 is applied a potential to accelerate electrons emitted from the electron-emitting device 15. In the electron beam emitting apparatus, a potential defining region 9 is provided a surface of the first plate on the electrode 8 side and a first potential defining region forming the potential defining region 9 is provided in a projective area of the electrode 8 onto the potential defining region 9; and, where d represents a distance between the electrode 8 and the potential defining region 9, an additional potential defining region is defined in the range of 0.83d in all directions parallel to the first plate from the edge of the projective area of the electrode 8 onto the potential defining region 9. This stabilizes trajectories of electrons and permits an excellent image to be formed without deviation of light emission positions.