The invention discloses a differential case, in particular relates to a differential case matched by a single-stage deceleration drive axle, which adopts a lightweight design. The differential case includes a differential left case and a differential right case, both of which are integrally cast, and have strong impact resistance, with no deformation or fracture happening. The precision positioning dimension of the differential right case is processed as a whole to ensure the accuracy of the positions of parts and improve the interchangeability. Lightweight design with unequal thickness is adopted for a left flange with larger self-weight. The differential left case and a fixing meshing sleeve are designed as an integral structure, which reduces the types of parts. Reinforcing ribs B are arranged between a right shaft hole and a right flange to meet the mechanical strength and effectively reduce the weight. A petal groove hollow structure is adopted for a right spherical cavity with larger self-weight to improve lightweight. Oil holes A and oil holes B are designed in large size. On the one hand, the weight of spherical cavity is further reduced. On the other hand, a larger oil hole is easier to forge and can lubricate various parts of the differential.