A vehicle gear includes: a disk portion having a disk shape and a plurality of through holes formed in a circumference direction thereof; and an outer circumference portion having outer circumference teeth formed on an outer circumference side of the disk portion. Further, each of the through holes includes first and second holes (82A, 82B) formed on one and another ends, respectively, thereof in the circumference direction, and a width of the first hole is larger than a width of the second hole in a radial direction of the disk portion.