The vehicle drive transmission device

PROBLEM TO BE SOLVED: To realize a drive transmission device for a vehicle in which an inner diameter of a rotation object member can be reduced.SOLUTION: In a drive transmission device for a vehicle, a case comprises a case wall 31 extending in a radial direction, a cylindrical support part 61 is configured from a member separately from the case wall 31, an object rotation member 22 is located on an outer side R2 in a radial direction with respect to the cylindrical support part 61, the cylindrical support part 61 comprises a first cylindrical member 62, and a second cylindrical member 63 which is fixed on an inner side R1 in a radial direction with respect to the first cylindrical member 62, a first oil passage A1 extending in an axial direction is formed between the first cylindrical member 62 and the second cylindrical member 63, a seal ring holding part 67 for holding a seal ring 81 is formed on an outer peripheral surface of the first cylindrical member 62, and a second oil passage A2, which is sealed in an axial direction by the seal ring 81, is formed between the outer peripheral surface of the first cylindrical member 61 and an inner peripheral surface of the object rotation member 22.SELECTED DRAWING: Figure 3