To provide a simple mounting shelf free of disassembling, extremely convenient for storage at the time of moving and nonuse by free disassembling and easily removing it even when it is once mounted and fixed by avoiding firm and definite fitting and fixing by nailing, with a wooden screw, an adhesive, etc., and a mounting fixture.

This simple mounting shelf is constituted of a holding body 3 to hold a mounting projected frame part A with an upper part as an hooking piece 22 and with a lower part as a fastening structural piece by bending upper and lower parts of an adhering back parts of a trunk part 21 to adhere an end part of a shelf plate 1 and a core body 4 fitted free to vertically move in a range of a fastening flap in the holding body 3 by being engaged with a head end part of the fastening structural piece and a bent base part of the hooking piece, and it is constituted to mount the projected frame part A by pressurizing and fixing it by mounting it between the hooking piece and the core body by pushing down the core body by a fastening screw 32 provided on a bottom part of the holding body fastening structural piece.