A vehicle differential device comprises: a differential casing rotatably disposed around a rotational axis; and a pair of side gears rotatably supported by the differential casing and supported in a thrust direction via an annular bearing surface formed in the differential casing to mesh with a pair of pinion gears. The differential casing is provided with a first lubricating oil passage formed in a circumferential direction on an outer circumferential side of the bearing surface in the differential casing, and a first guidance projection projected toward the rotational axis in the first lubricating oil passage and guiding a lubricating oil flowing in a circumferential direction in the first lubricating oil passage due to rotation of the differential casing around the rotational axis, toward a first meshing portion between a first side gear of the pair of side gears and the pinion gears.