The invention relates to the multistage transmission. And particularly, as the invention relating to the apparatus which implements the transmission which is compact using the planetary gear set in terms of the more multi-stage and in which the smooth shift is comprised using the constrained restoration means about the backward direction operation according to the down-shift as well as the regular direction operation according to the acceleration operation It is comprised that the additional shift is axially made through the interlocking or the cancel release of the derive fall rotating with the it is rotatively impossible derive fall clutch as to the speed change part which speed-changes the rotatory power inputted with the sprocket the planetary gear set and the one-way clutch consisting of the shaft the sprocket and the sun gear, the planetary gear, the carrier, the ring gear prepared inside the hub shell are included and outputted to the hub shell and the multistage transmission including the control unit in which the pole prepared in the shaft is controlled according to the operation of the gearshift and which selectively limits the rotation of the sun gear and controlling the shift according to the rotation operation of the gearshift of the shaft with the ectopic development of the derive fall clutch. The marketability of the product is improved and the use convenience of the user is maximized.