The invention relates to the herb built-in multistage transmission. And particularly, as the invention relating to the apparatus in which it implements the multi-stage transmission in terms of the built-in transmission which is compact among the multi-stage planetary gear set more than the first or two stages and 2 using one way clutch and it gives the overrunning function in the inertia driving and simultaneously the fast shift is crowded with the driving traveling state using the forced shift function through the small operating force of the gearshift. the second output clutch which delivers the rotatory power of the driver to the ring gear is included positioned in the pawl mounting portion formed in the outer periphery of the shaft it rotates at the columnar direction according to the operation is controlled according to the difference of the rotating speed it is prepared as one way clutch made with the planetary gear set, the first output clutch prepared as one way clutch between the carrier and hub shell, and in one body, it has the predetermined phase angle difference consisting of the planetary gear set, the first output clutch prepared as one way clutch between the carrier and hub shell, and in one body, it has the predetermined phase angle difference of 2 between the driver, the ring gear interval, the ring gear and hub shell and which selectively limits the rotation of the sun gear. It is about the apparatus for the fast shift being made in the driving traveling state using the forced shift function through the small operating force of the gearshift and improving the shift accuracy.