To provide a gearshift device of vehicle which realizes the improvement of operating feeling.

In a gearshift device 21 in which one side of a shift fork 26 is provided slidable to a fork shaft 25 in the axial direction, as well as the rotation force of a crankshaft 15 is transmitted from an input shaft 17, to mission gear trains 19 and 20, and an output shaft 18, passing through a constantly engaging gear train, through a clutch mechanism, and the mission gear trains 19 and 20 are combined to or cut off from the other neighboring gear by sliding the shift fork 26, the fork shaft 25 is made to rotate constantly while the crankshaft 15 is being rotated.