BELT TYPE STEPLESS TRANSMISSION

A belt-type continuously variable transmission is provided in which a transmission case through hole (7a) is formed in a mounting part (24) of a transmission case (7), the transmission case through hole (7a) extending from the interior to the exterior of the transmission case (7), an actuator case through hole (16a) is formed in a fixed portion (14a) of an actuator case (16), the actuator case through hole (16a) extending from the interior to the exterior of the actuator case (16), and a communication passage (14e) is formed in the mating faces of the mounting part (24) and the fixed portion (14a) by indenting at least one of the mounting part (24) and the fixed portion (14a) into a groove shape, the communication passage (14e) providing communication between the through holes (7a, 16a). Thus, it is possible to form a drainage-cum-breather passage in the actuator case by a simple operation and at a low cost, the drainage-cum-breather passage regulating the pressure change within the actuator case and enabling moisture to be discharged outside the actuator case, without using a tube exclusively used for the passage and while preventing water or dirt from entering the actuator case through an opening at the downstream end.