To provide a mounting tool which allows a plurality of boxes etc. to be mounted thereon in a manner freely adjusting intervals between the boxes etc., by simple fixing work for mounting plates on support bars.

The mounting tool for the boxes etc. is formed of the plurality of mounting plates 10 mounted on the boxes etc., and a pair of the support bars 30 inserted into support bar insertion fixing portions 17 formed at upper and lower portions of each mounting plate 10, for allowing each mounting plate 10 to be connected thereto, and having both ends thereof fixed to reinforcements (support members) 41 on the periphery thereof. According to the mounting tool, all of the support bar insertion fixing portions 17 or specific ones of the same are slidably fitted onto the support bars 30, and part of the exposed support bars 30 are curved. Then a curved portion of each bar is inhibited from shifting at a location between support bar insertion fixing portion unit bodies (displacement inhibiting portions) 17a, and therefore the slidable support bar insertion fixing portion 17, is made nonslip along the support bar 30, whereby the interval between the adjacent mounting plates 10 is fixed.