Abstract: A clutch mechanism having a drive shaft operatively connected to a drive section of a working vehicle, and a driven shaft connected to a working implement such as a mower unit. The clutch mechanism includes a clutch mounted on the drive shaft to be operable between an ON state to transmit drive from the drive shaft to the driven shaft, and an OFF state to break drive transmission; a transmission shaft connected to the clutch; and a shift device connected to the clutch to be shiftable between a first position corresponding to the ON state of the clutch and a second position corresponding to the OFF state of the clutch. The shift device has a clutch control device shiftable to control the clutch, and a first helical gear axially movably mounted on the transmission shaft. The clutch mechanism further includes a second helical gear rotatable with the driven shaft and meshed with the first helical gear, and a brake for applying a braking force to the shift device when the shift device is in the second position.