Disclosed is a washing machine which is properly treated noise and abnormal sound generated by a transmission when the transmission is introduced into the washing machine in order to efficiently use a motor. When the transmission (8) is introduced between an output shaft (72m) of the motor (72) and the input shaft (80m) of the rotation part (80), the transmission (8) includes: a variable driving side pulley unit (81) arranged on a side of the output shaft (72m); a variable driven side pulley unit (82) arranged on a side of the input shaft (80m); a driving belt (83) capable of transferring the power between the variable driving side pulley unit (81) and the variable driven side pulley unit (82); a rotating speed sensing part (81c) arranged in the driving side pulley unit (81) and configured to change a pulley diameter with the increase of rotating speed; and a torque cam mechanism (82f) arranged between pulley hubs (82d) and (82e) that form a movable pulley (82a) and a fixed pulley (82b) of the driven side pulley unit (82) and configured to control speed variation time when the pulley diameter varies in a reversing direction with the increase of the rotating speed via cam grooves (82f1) and pins (82f2). The cam grooves (82f1) of the torque cam mechanism (82f) adopt the following structure: the cam grooves each have a first guiding groove (82f11) which is inclined in one direction relative to a specific generatrix (C) on the pulley hub (82e) and a second guiding groove (82f12) which is inclined in the opposite direction relative to the generatrix (C). The pins (82f2) are guided into the first guiding groove (82f11) when the pulley unit (82) performs forward-rotation speed variation, and are guided into the second guiding groove (82f12) when the pulley unit (82) performs backward-rotation speed variation.