In the first embodiment, the first partitioning wall 210 is provided on one side facing the second partitioning wall 220 with a guide rail unit 211, to which the pulling member 110 is movably coupled, so that the pulling member 110 can be moved relative to the first partitioning wall 210 in a direction away from the circuit board 400 and toward the opening of the object.

When the handle member 120 is operated to turn from the closed position to the pulled-out position, since the vertical distance D1 between the pulling-out edge 121B of the pressing section 121 and the second pivot section 122 is larger than the vertical distance D2 between the closing edge 121A of the pressing section 121 and the second pivot section 122, the pulling member 110 is brought by the handle member 120 to move outward relative to the first partitioning wall 210. At this point, the abutting section 112 pushes the corresponding apparatus 300 forward to thereby separate the latter from the connection port 410 and bring a front side of the corresponding apparatus 300 to extend beyond the first and the second partitioning wall 210, 220. Then, the handle member 120 can be further outward pulled by a predetermined distance for the corresponding apparatus 300 to expose more from the opening of the object and a user can conveniently remove the corresponding apparatus 300 from the object with one hand.