To easily assemble a knockdown shelf provided with a roller.

This knockdown shelf is provided with plural roller holders 11 for aligning the plural rollers 15 whose rotary axes are parallel to each other in a direction vertical to the rotary axes of the rollers 15 and rotatably holding them. A roller shaft supporting groove pair 14 extended from the peak part of an annular part while facing each other is formed on the inner side wall 13a of the annular part 13 of the roller holder 11 and the plural roller shaft supporting groove pairs 14 are formed separately in the longitudinal direction of the roller holder 11. A roller shaft 15a is received inside the roller shaft supporting groove 14 and the roller 15 is supported. Mutually separately and parallelly extended plural holder fitting grooves 12 are formed inside the peak surface of a shelf plate base material 10, the roller holder 11 is fitted inside the holder fitting groove 12 and this shelf plate 8 with the roller is formed. By the shelf receiver 7 of the assembly shelf and the supporting stage 5a of a frame 5, the shelf plate 8 with the roller is supported so as to make the longitudinal axis of the roller holder 11 vertical to the bay surface of the assembly shelf.