A locking/unlocking device for electronic boards, the boards being configured to be inserted into an electronic cabinet with at least one slotted plate fit into the rack of the electronic cabinet, the device including a substantially rectangular frame supporting at least one locking slide that locks the electronic board onto the slotted plate through the action of a locking element. The device further includes an extracting lever that rotates between a rest and a locking position around a lateral Y1 axis, the extracting lever fitted so that exerting force is possible along the longitudinal X axis between the electronic board, or the frame and the rack, with the locking unit including an extension to be placed outside, opposite the extracting lever along the longitudinal axis X of the board when the two levers are engaged in the locking position.