Provided is a slide lock structure for a slide rail device which can produce a reliable locked state with a high and reliable mechanical strength by using a simple structure. The slide lock structure includes a casing, a pair of lock members provided on the casing, and each provided with a cam surface formed on an outer side thereof, and engagement projections projecting laterally outward so as to be laterally movable between an engaged position in which the engagement projections are received in the slots, and a disengaged position in which the engagement projections are dislodged from the slots, a compression coil spring urging the lock members toward the engaged position, and an operating member provided on the casing in a movable manner, and provided with a cooperating cam surface slidably engaging the cam surface such that the lock members are moved to the disengaged position against a biasing force of the compression coil spring as the operating member is moved vertically.