PURPOSE: To ensure safety at the time of operation by restricting respective rails so that the operation order of the rails at a time of the drawing-out and housing of an inner short type rail becomes constant by providing a protruding part capable of arbitrarily changing spring force by the push spring provided to the rear part of a spring and the cavity part bringing the protruding part into engagement with an inner rail. CONSTITUTION: A restricting lock 5 is pushed by a coil spring and engaged with the receiving groove 7 provided to outer rails 1 to increase the slide resistance between rails. Further, since a push screw 11 is movable in the direction vertical to a slide surface, the spring force of the coil spring 10 is made variable. That is, the slide resistance value between rails can be adjusted. When a drawer unit 4 is housed, at first, the restricting lock 5 between outer and inter rails is detached and an inner rail low in slide resistance begins to move and, when it is perfectly housed in the outer rail 1, the prescribing lock 5 is engaged with the prescribing lock receiving groove 7.
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