A cathode structure and an electron gun using the cathode structure are disclosed.;The electron gun using the cathode structure includes a cathode structure forming a triode, a control electrode and a screen electrode, and a plurality of focus electrodes and final acceleration electrodes forming an auxiliary lens and a main lens, and the cathode structure is a rim-shaped electrode. A plurality of pins having a member, an insulating member inserted into the electrode member and having a through hole formed therein, a contact portion immersed in the insulating member and having an end portion protruding from an upper surface of the insulating member and bent toward the support hole side; A field emission element unit inserted into the support hole and having a terminal provided at an edge thereof closely contacting the contact portion of the pin, and a support member fixed to the rim electrode member to press the field emission element unit inserted into the through hole toward the contact portion side; It is characterized by being included, which can improve the structural strength.
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