Abstract: A continuously variable transmission is provided with a driving pulley comprising a stationary half pulley fixed to a driving shaft and a movable half pulley, and a driven pulley comprising a stationary half pulley fixed to a driven shaft and a movable half pulley. A V-groove is formed between the stationary half pulley and the movable half pulley and adjustable by moving the movable half pulley in the axial direction in each of the driving pulley and the driven pulley. An endless belt is wrapped to each V-groove, and rotation of the driving shaft is transmitted to the driven shaft steplessly. A slider gear disposed in the axial direction is connected one or both half pulleys of the driving pulley, and is threadedly engaged with a slider shaft and driven by a driving source and moved forward or rearward in the axial direction on the slider shaft, so that one or both half pulleys are moved forward or rearward in the axial direction and the distance between both half pulleys is adjusted.