Drive unit comprising: a drive shaft; a driven shaft arranged separately from the drive shaft; a continuously variable transmission having a driving side pulley mounted on the drive shaft, a driven side pulley mounted on the driven shaft, and a belt looped around the driving side pulley and the driven side pulley; and a case (50,500) housing the continuously variable transmission, wherein the case (50,500) includes a drive shaft supporting portion (52a,520a) supporting an end portion of the drive shaft, a driven shaft supporting portion (52b,520b) supporting an end portion of the driven shaft, and a support column portion (52c,520c) bridged between the drive shaft supporting portion (52a,520a) and the driven shaft supporting portion (52b,520b), wherein the case (50,500) includes a support member (52,520,520A) that comprises the drive shaft supporting portion (52a,520a) and the driven shaft supporting portion (52b,520b) and the support column portion (52c,520c), and a case body (51,510) that houses the continuously variable transmission and comprises the support member (52,520,520A) fixed thereto, characterized in that the end portion of the drive shaft and/or the end portion of the driven shaft is/are exposed in axial direction from an opening (51e,51f) formed in the case body (51,510) and is/are rotatably supported by at least one bearing (53,56) arranged outside the opening (51e,51f) in axial direction, the opening (51e,51f) having a come-off preventing portion (51g,58a) sandwiching the bearing (53,56) between the come-off preventing portion (51g,58a) and the support member (52,520,520A) formed on at least a portion of a peripheral edge of the opening (51e,51f). a drive shaft; a driven shaft arranged separately from the drive shaft; a continuously variable transmission having a driving side pulley mounted on the drive shaft, a driven side pulley mounted on the driven shaft, and a belt looped around the driving side pulley and the driven side pulley; and a case (50,500) housing the continuously variable transmission, wherein the case (50,500) includes a drive shaft supporting portion (52a,520a) supporting an end portion of the drive shaft, a driven shaft supporting portion (52b,520b) supporting an end portion of the driven shaft, and a support column portion (52c,520c) bridged between the drive shaft supporting portion (52a,520a) and the driven shaft supporting portion (52b,520b), wherein the case (50,500) includes a support member (52,520,520A) that comprises the drive shaft supporting portion (52a,520a) and the driven shaft supporting portion (52b,520b) and the support column portion (52c,520c), and a case body (51,510) that houses the continuously variable transmission and comprises the support member (52,520,520A) fixed thereto, characterized in that the end portion of the drive shaft and/or the end portion of the driven shaft is/are exposed in axial direction from an opening (51e,51f) formed in the case body (51,510) and is/are rotatably supported by at least one bearing (53,56) arranged outside the opening (51e,51f) in axial direction, the opening (51e,51f) having a come-off preventing portion (51g,58a) sandwiching the bearing (53,56) between the come-off preventing portion (51g,58a) and the support member (52,520,520A) formed on at least a portion of a peripheral edge of the opening (51e,51f).