To provide an electron gun and a cathode-ray tube using it, which can decrease voltage applied to an acceleration electrode according to the simple electrode structure of a electron gun, even if a diameter of a electronic beam passage hole of a control electrode is made small.

A negative electrode 9, the control electrode 10, and the acceleration electrode 11 are arranged in order, and electronic beam passage holes 12 and 13 are formed, which pass the electronic beam, which is emitted from the negative electrode 9, in the control electrode 10 and the acceleration electrode 11, respectively. A recess 14 is formed in the surface by the side of the acceleration electrode 11 of the control electrode 10, and a protrusion 15 is formed in the surface by the side of the control electrode 10 of the acceleration electrode 1. Thereby, since substantial distance of the control electrode and the acceleration electrode surrounding the electronic beam passage hole can be made small, voltage applied to the acceleration electrode can be made small.