Rear vehicle-body structure of vehicle

1. A rear vehicle-body structure of a vehicle, comprising:

a damper support section for a rear suspension provided at a lower part of a rear wheel house;

a first loop-shaped structure section provided to extend continuously along a lower wall part, right-and-left both side wall parts, and an upper wall part of a vehicle body so as to have a loop shape in a vehicle elevational view, the first loop-shaped structure section being positioned on a forward side, in a vehicle longitudinal direction, of said damper support section; and

a second loop-shaped structure section provided to extend continuously along a lower wall part, right-and-left both side wall parts, and an upper wall part of the vehicle body so as to have a loop shape in the vehicle elevational view, the second loop-shaped structure section being positioned on a rearward side, in the vehicle longitudinal direction, of said damper support section,

wherein each of said first and second loop-shaped structure sections is formed by a closed-cross section portion where a closed-cross section is partitioned by plural members and/or a thick plate portion having a thicker plate thickness than a vehicle-body panel, and

said second loop-shaped structure section comprises the vehicle-body lower wall part of a closed-cross section portion extending in a vehicle width direction which is formed by a floor panel and a floor cross member joined to the floor panel, each of the vehicle-body side wall parts of a closed-cross section portion extending in a vehicle vertical direction which is formed by the rear wheel house and a side panel and a first brace member which is joined to the rear wheel house and the side panel, and the vehicle-body upper wall part of a closed-cross section portion extending in the vehicle width direction which is formed by a roof panel and a rear header joined to the roof panel.

2. The rear vehicle-body structure of the vehicle of claim 1 , wherein said first loop-shaped structure section comprises the vehicle-body lower wall part of a closed-cross section portion extending in a vehicle width direction which is formed by the floor panel and a second floor cross member joined to the floor panel, each of the vehicle-body side wall parts of closed-cross section portions extending in a vehicle vertical direction which are formed by the rear wheel house and a second brace member and a pillar which are joined to said rear wheel house, and the vehicle-body upper wall part of a closed-cross section portion extending in the vehicle width direction which is formed by a roof panel and a roof reinforcement joined to the roof panel.

3. The rear vehicle-body structure of the vehicle of claim 1 , wherein said first loop-shaped structure section and said second loop-shaped structure section are interconnected in the vehicle longitudinal direction via a damper-support reinforcing member for the rear suspension.

4. The rear vehicle-body structure of the vehicle of claim 3 , said damper support section for the rear suspension is provided at a rear side frame, and said damper-support reinforcing member for the rear suspension is fixed to a floor portion of an upper surface of said rear side frame.

5. The rear vehicle-body structure of the vehicle of claim 3 , further comprising a third loop-shaped structure section provided to extend continuously along the vehicle-body lower wall part of said first loop-shaped structure section, right-and-left both lower-side wall parts of the vehicle body, each of which comprises said damper-support reinforcing member and a closed-cross section portion extending in the vehicle longitudinal direction which is formed by a rear side frame, and a rear wall part of the vehicle body which is formed by a closed-cross section portion formed by a rear end panel and a rear end cross member joined to the rear end panel so as to have a loop shape in a vehicle plan view.

6. The rear vehicle-body structure of the vehicle of claim 5 , wherein the rear side frame and the rear end cross member of said third loop-shaped structure section are interconnected via a rear-bumper-reinforcement attachment reinforcing member.

7. A rear vehicle-body structure of a vehicle, comprising:

a damper support section for a rear suspension provided at a lower part of a rear wheel house;

a first loop-shaped structure section provided to extend continuously along a lower wall part, right-and-left both side wall parts, and an upper wall part of a vehicle body so as to have a loop shape in a vehicle elevational view, the first loop-shaped structure section being positioned on a forward side, in a vehicle longitudinal direction, of said damper support section; and

a second loop-shaped structure section provided to extend continuously along a lower wall part, right-and-left both side wall parts, and an upper wall part of the vehicle body so as to have a loop shape in the vehicle elevational view, the second loop-shaped structure section being positioned on a rearward side, in the vehicle longitudinal direction, of said damper support section,

wherein each of said first and second loop-shaped structure sections is formed by a closed-cross section portion where a closed-cross section is partitioned by plural members, and

said second loop-shaped structure section comprises the vehicle-body lower wall part of a closed-cross section portion extending in a vehicle width direction which is formed by a floor panel and a floor cross member joined to the floor panel, each of the vehicle-body side wall parts of a closed-cross section portion extending in a vehicle vertical direction which is formed by the rear wheel house and a side panel and a first brace member which is joined to the rear wheel house and the side panel, and the vehicle-body upper wall part of a closed-cross section portion extending in the vehicle width direction which is formed by a roof panel and a rear header joined to the roof panel.