A power transfer unit for extracting torque from a transmission of an automobile, comprising: a casing having a first side having a coupling portion for combining with the transmission and a second side opposed to the first side; a first shaft being rotatably supported by a first bearing and a second bearing and combining with the transmission to receive the torque; a second shaft being rotatably supported by a third bearing and a fourth bearing and gearing with the first shaft to rotate in parallel with the first shaft, the second shaft comprising a bevel gear; and a third shaft being rotatably supported by the casing and extending in a direction distinct from the first shaft and the second shaft, the third shaft comprising an internal end including a pinion gear in mesh with the bevel gear and an external end led out of the casing, wherein the first bearing is disposed closer in a lateral direction to the coupling portion than the bevel gear and the pinion gear are, wherein the first side comprises a first race fitting on an entire circumference of the first bearing and a third race fitting on an entire circumference of the third bearing, the second side comprises a second race fitting on an entire circumference of the second bearing and a fourth race fitting on an entire circumference of the fourth bearing, and wherein the casing is dividable into a first part including the first side and a second part including the second side, characterized in that: the first shaft penetrates the casing from the coupling portion to the second side of the casing, and the first bearing and the third bearing sit on the first part, and the second bearing and the fourth bearing sit on the second part. a casing having a first side having a coupling portion for combining with the transmission and a second side opposed to the first side; a first shaft being rotatably supported by a first bearing and a second bearing and combining with the transmission to receive the torque; a second shaft being rotatably supported by a third bearing and a fourth bearing and gearing with the first shaft to rotate in parallel with the first shaft, the second shaft comprising a bevel gear; and a third shaft being rotatably supported by the casing and extending in a direction distinct from the first shaft and the second shaft, the third shaft comprising an internal end including a pinion gear in mesh with the bevel gear and an external end led out of the casing, wherein the first bearing is disposed closer in a lateral direction to the coupling portion than the bevel gear and the pinion gear are, wherein the first side comprises a first race fitting on an entire circumference of the first bearing and a third race fitting on an entire circumference of the third bearing, the second side comprises a second race fitting on an entire circumference of the second bearing and a fourth race fitting on an entire circumference of the fourth bearing, and wherein the casing is dividable into a first part including the first side and a second part including the second side, the first shaft penetrates the casing from the coupling portion to the second side of the casing, and the first bearing and the third bearing sit on the first part, and the second bearing and the fourth bearing sit on the second part.