In a bicycle transmission, a driven sprocket wheel body includes a plurality of driven sprocket wheels which are connected with a drive sprocket wheel by an endless chain. A derailleur is provided for changing over the winding of the endless chain among the plurality of driven sprocket wheels. The drive sprocket wheel is prevented from moving beyond a given range even when an excessive external force is applied to the drive sprocket wheel at the time of traveling. A slide member is movable in the axial direction of a drive shaft and is provided between the drive shaft and a drive sprocket wheel. A drive sprocket wheel movement restricting member is provided which sandwiches the drive sprocket wheel position setting member and moves in the axial direction of the drive shaft together with the drive sprocket wheel.