Abstract: A lower vehicle-body structure comprises a vehicle floor comprising a bottom face portion and a floor tunnel which protrudes upwardly and extends in a vehicle longitudinal direction, a pair of right-and-left floor cross members extending in a vehicle width direction on both sides of the floor tunnel, and a connecting member provided to extend in the vehicle width direction at a position which overlaps the floor cross members in the vehicle longitudinal direction and be fixed to at least one of the vehicle floor and the floor cross members at plural fixation positions. These plural fixation positions are located at plural different levels in a range of a height of the floor cross members.

Abstract: A transmission-side mount bracket includes connection portions which connect a front-side leg portion and a rear-side leg portion of a leg member, a middle attachment (fixation) portion which is provided at the connection portions at a position located between the front-side leg portion and the rear-side leg portion and fixed to the powertrain, and a rigidity-reduction portion (an opening portion) which has the rigidity against a load applied in the vehicle width direction which is lower than that of the front-side leg portion and the rear-side leg portion and is provided at a position located in the vicinity of the middle attachment (fixation) portion.

Abstract: At least one of a pair of right and left motor unit support systems for mounting and supporting a motor unit (71) on a cross member (80) is fastened and fixed to an upper part of the motor unit (71) by a first shaft-like fastening member (a first bolt (101)). An axial direction of the first shaft-like fastening member (the first bolt (101)) is the same as a vehicle longitudinal direction in a state in which the at least one of the motor unit support systems is fastened and fixed to the upper part of the motor unit (72).

Abstract: A lower vehicle-body structure comprises a vehicle floor comprising a bottom face portion and a floor tunnel which protrudes upwardly and extends in a vehicle longitudinal direction, a pair of right-and-left floor cross members extending in a vehicle width direction on both sides of the floor tunnel, and a connecting member provided to extend in the vehicle width direction at a position which overlaps the floor cross members in the vehicle longitudinal direction and be fixed to at least one of the vehicle floor and the floor cross members at plural fixation positions. These plural fixation positions are located at plural different levels in a range of a height of the floor cross members.

Abstract: At least one of a pair of right and left motor unit support systems for mounting and supporting a motor unit (71) on a cross member (80) is fastened and fixed to an upper part of the motor unit (71) by a first shaft-like fastening member (a first bolt (101)). An axial direction of the first shaft-like fastening member (the first bolt (101)) is the same as a vehicle longitudinal direction in a state in which the at least one of the motor unit support systems is fastened and fixed to the upper part of the motor unit (72).

Abstract: In a vehicle in which a power transmission mechanism in a floor tunnel is supported by a mount member, it is possible to achieve compatibility between suppression of deformation of the floor tunnel and reliable support of the mount member while achieving weight reduction of the vehicle body and simplification of the vehicle body structure. The mount member that supports the power transmission mechanism arranged in the floor tunnel from below is fixed at a predetermined fixed position with respect to at least one of the vehicle body floor and the floor cross member, and the fixed position is arranged to overlap with the floor cross member in the vehicle longitudinal direction, is arranged outside of the floor tunnel in a vehicle width direction, and is arranged upward of the bottom surface part of the vehicle body floor in a vehicle vertical direction.

Abstract: A transmission-side mount bracket includes connection portions which connect a front-side leg portion and a rear-side leg portion of a leg member, a middle attachment (fixation) portion which is provided at the connection portions at a position located between the front-side leg portion and the rear-side leg portion and fixed to the powertrain, and a rigidity-reduction portion (an opening portion) which has the rigidity against a load applied in the vehicle width direction which is lower than that of the front-side leg portion and the rear-side leg portion and is provided at a position located in the vicinity of the middle attachment (fixation) portion.