The present invention relates to a main circuit board fixing device of VSI, and an object of the present invention is to stably fix the main circuit board to the main chassis by a fixing device that rotates around the hinge axis when the front panel and the main chassis are combined. The present invention provides a main circuit board fixing device of VSI.;The constitution of the present invention is a hook-shaped elastic piece 41 which is elastically deformed, a plate-shaped connecting piece 42 connecting the elastic piece 41 and the rotational center portion 43, and a rotational center portion 43 having a recessed groove. And a contact protrusion 44 protruding from the lower portion of the connecting piece 42 to prevent the flow of the main circuit board caused by external impact or vibration, and to prevent abnormal short circuit and contact failure occurring in the contact portion. It is effective in preventing the malfunction and malfunction caused by knob operation and sudden contact failure during insertion of the main circuit board.
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