Automotive rear vehicle body structure

1. An automotive rear vehicle body structure comprising:

right and left rear side frames; a vehicle-body cross member mutually coupling the right and left rear side frames and defining a closed cross-section in cooperation with a vehicle-body floor panel; and a rear subframe for supporting a rear suspension, wherein:

the rear subframe has right and left side member segments, and front and rear cross member segments each mutually coupling the right and left side member segments;

each of the right and left side member segments has a rear region provided with a rear fixing section attached to a respective one of the right and left rear side frames, and a front region provided with a front fixing section attached to the vehicle-body cross member;

a position of the front fixing section of each of the side member segments is set to be located inward of the respective one of the rear side frames in a vehicle width direction;

each of the side member segments is provided with an arm support section at a position rearward of the front fixing section, the arm support section being configured to pivotally support a suspension arm of the rear suspension;

the rear cross member segment comprises a central portion located forward of the rear fixing section of each of the side member segments, a rearwardly-inclined portion extending from the central portion obliquely toward the rear fixing section of each of the side member segments, and a forwardly-inclined portion extending outwardly in the vehicle width direction and forwardly while being branched with respect to the rearwardly-inclined portion; and

the central portion of the rear cross member segment is provided with two rear arm support sections at right and left portions thereof, each of the rear arm support sections being configured to pivotally support a rear arm located rearward of the suspension arm.

2. The automotive rear vehicle body structure as defined in claim 1 , wherein each of the side member segments has a region extending from the rear fixing section thereof obliquely inwardly in the vehicle width direction and forwardly, to allow a rear suspension spring to be installed forward of the oblique region.

3. The automotive rear vehicle body structure as defined in claim 1 , wherein each of the side member segments is formed into a pipe-like shape.

4. The automotive rear vehicle body structure as defined in claim 1 , wherein the suspension arm comprises an upper arm, and a lower arm located below the upper arm, and wherein

the arm support section comprises an upper-arm support sub-section configured to pivotally support the upper arm, and a lower-arm support sub-section configured to pivotally support the lower arm, the upper-arm support sub-section and the lower-arm support sub-section being provided at the same position in a vehicle front-rear direction.

5. The automotive rear vehicle body structure as defined in claim 1 , wherein all of the central portion, the forwardly-inclined portion and the rearwardly-inclined portion of the rear cross member segment are formed into a pipe-like shape.

6. The automotive rear vehicle body structure as defined in claim 2 , wherein each of the side member segments is formed into a pipe-like shape.

7. The automotive rear vehicle body structure as defined in claim 3 , wherein all of the central portion, the forwardly-inclined portion and the rearwardly-inclined portion of the rear cross member segment are formed into a pipe-like shape.