A container fastener, with the use of which members such as a pallet, roof, sleeve, etc. are firmly fastened and fastening between the sleeve and the pallet and that between the sleeve and the roof are not unfastened, and an easily assembled and disassembled knockdown container using the fastener. A fastener, assembled by screwing a shank of a key (20) into a fastener body (10), is mounted on a sleeve (60), and the sleeve (60) is mounted on a pallet (70) with a rotation stop position of a knob of the key (20) adjusted so that the knob can pass through a connecting hole formed in the pallet (70). After that, the knob is rotated to advance the shank in the direction of the fastener body (10), the key is tightened by screw action until there is no play between the sleeve (60) and the pallet (70), and the rotation stop position of the knob is adjusted so that the knob does not fall out of the connecting hole. Thus, the sleeve (60) and the pallet (70) can be firmly fastened.