Patent ID: 8371978

Claim:
A vehicle transmission, comprising: an input shaft that is connected to a driving source and rotates; a countershaft provided parallel to the input shaft; a differential unit, which is positioned below the countershaft, to which rotation is input from the countershaft, and which is coupled to right and left wheels; a case member that contains the input shaft, the countershaft, and the differential unit; a differential chamber that is located in the case member, contains the differential unit, and is separated from a storage chamber that stores oil; and a differential separation member that separates the differential chamber from the storage chamber, and is formed along a ring gear of the differential unit, which meshes with an output gear of the countershaft, wherein the differential separation member has an opening that opens so that the output gear can mesh with the ring gear, a communication portion, which is formed in an upper part of the differential separation member, and is located on an upstream side of the opening in a rotation direction of the ring gear during forward traveling, and which discharges the oil from the differential chamber, and a wall member that is provided on a side of a meshing portion of the output gear and the ring gear with respect to the communication portion, and stands so as to contact an outer surface of the differential separation member.