A vehicle gear for a vehicle comprising: 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, wherein each of the through holes includes a first hole formed on one end of the through hole in the circumference direction, which is arranged to receive a pulling force while the vehicle travels backward, and a second hole formed on another end of the through hole in the circumference direction, which is arranged to receive a pulling force while the vehicle travels forward, a width of the first hole is larger than a width of the second hole, in a radial direction of the disk portion, and each of the through holes further includes a slit formed in a center portion of the through hole in the circumference direction, the slit having a width smaller than a width of the first hole in the radial direction, the slit connecting the first hole and the second hole to each other, wherein for each through hole: the first hole has a shape in which an arc of a circle defined by the first hole and having a diameter larger than the width of the slit is continuous with a side of the slit extending in the circumference direction, and the second hole has a shape in which an arc of a circle defined by the second hole and having a diameter smaller than the diameter of the first hole is continuous with a side of the slit extending in the circumference direction. 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, wherein each of the through holes includes a first hole formed on one end of the through hole in the circumference direction, which is arranged to receive a pulling force while the vehicle travels backward, and a second hole formed on another end of the through hole in the circumference direction, which is arranged to receive a pulling force while the vehicle travels forward, a width of the first hole is larger than a width of the second hole, in a radial direction of the disk portion, and each of the through holes further includes a slit formed in a center portion of the through hole in the circumference direction, the slit having a width smaller than a width of the first hole in the radial direction, the slit connecting the first hole and the second hole to each other, wherein for each through hole: the first hole has a shape in which an arc of a circle defined by the first hole and having a diameter larger than the width of the slit is continuous with a side of the slit extending in the circumference direction, and the second hole has a shape in which an arc of a circle defined by the second hole and having a diameter smaller than the diameter of the first hole is continuous with a side of the slit extending in the circumference direction. the first hole has a shape in which an arc of a circle defined by the first hole and having a diameter larger than the width of the slit is continuous with a side of the slit extending in the circumference direction, and the second hole has a shape in which an arc of a circle defined by the second hole and having a diameter smaller than the diameter of the first hole is continuous with a side of the slit extending in the circumference direction.