As can be seen in FIG. 11, the pulling member 110 can have a bent section 115, which is located adjacent to the first pivot section 111 and inclined toward the first partitioning wall 210 by 2 to 90 degrees. The bent section 115 is provided with a male foolproof retainer 1151 for ensuring correct mounting of the corresponding apparatus 300 in the object. That is, when the corresponding apparatus 300 is correctly mounted, the abutting section 112 and the foolproof retainer 1151 are pressed against two opposite end surfaces of the corresponding apparatus 300. On the other hand, in the case the corresponding apparatus 300 is not correctly mounted in the object, the foolproof retainer 1151 interferes with the corresponding apparatus 300 and the pull-out aiding device 100 could not be pushed into the object. And, when the pulling member 110 has not yet been pulled outward, the bent section 115 is pushed by the first partitioning wall 210 against the corresponding apparatus 300 and is accordingly located in parallel to the first partitioning wall 210. On the other hand, when the pulling member 110 is outward pulled relative to the first partitioning wall 210 and the bent section 115 is exposed from the object, the bent section 115 automatically inclines outward relative to the corresponding apparatus 300 and the foolproof retainer 1151 does not hinder the removal of the corresponding apparatus 300 from the object, allowing the corresponding apparatus 300 to be pulled out smoothly.