Rear vehicle body structure

A rear vehicle body structure comprising:

• left and right rear side frames (11, 12) provided in a rear vehicle body section;
• front and rear cross members (14, 15) spanning between the left and right rear side frames (11, 12) with a predetermined interval between the cross members;
• and
• a sub-frame (16) disposed beneath the front and rear cross members and having rear suspensions (18, 19) provided thereon,
• said sub-frame including:
• left and right sub side members (51, 52) each having a substantially U shape such that said left and right sub side members project inwardly toward a centerline of the vehicle body;
• a front sub cross member (53) spanning between respective near-front-end regions of said left and right sub side members;
• and
• a rear sub cross member (54) spanning between respective near-rear-end regions of said left and right sub side members,
• wherein the left and right sub side members (51, 52) and the front and rear sub cross members (53, 54) together constitute a framework (46) of a substantially rectangular shape,
• said left sub side member (51) of the substantially U shape includes a left rear extension portion (58) extending from the framework toward a rear of the vehicle body, the left rear extension portion being connected to a joint section (42) where the rear cross member (15) and the left rear side frame (11) are joined together, and
• said right sub side member (52) of the substantially U shape includes a right rear extension (63) portion extending from the framework toward the rear of the vehicle body, the right rear extension portion being connected to a joint section (44) where the rear cross member (15) and the right rear side frame (12) are joined together.