PURPOSE: To provide an electron beam generating device which can prevent beams from being enlarged in the direction roughly perpendicularly intersected with the direction of voltage application by element electrodes in the electron beam generating device equipped with an electron source having a plurality of cold cathode electron emitting elements, and with an electron source provided with accelerating electrodes acting on emitted electrons.

CONSTITUTION: The device is equipped with an electron source having a plurality of cold cathode electron emitting elements, which is formed of a electron emitting section 1201, and paired element electrodes 1202 and 1203 for applying voltage to the electron emitting section, and with an electron source provided with accelerating electrodes disposed face-to-face at the electron emitting section to apply accelerating voltage to electrons emitted from the electron emitting section. And an equipotential surface 1205 roughly in a recessed shape is formed in the direction perpendicularly intersected with the direction of voltage application in a surface which is formed by both directions of voltage application by the paired element electrodes 1202 and 1203, and the direction of voltage application by the accelerating electrodes.