Vehicle body rear part structure

A vehicle body rear part structure, comprising:

• a pair of right and left rear side frames that are arranged substantially along a vehicle body front-to-rear direction;
• a rear floor panel that is provided on the pair of rear side frames;
• a rear panel that is arranged to stand at a rearward position of the pair of rear side frames and that is joined to rear ends of the pair of rear side frames and a rear end of the rear floor panel;
• a rear bumper beam that extends substantially along a vehicle width direction on a rearward side of the rear panel;
• and
• a pair of extensions that connect together the rear panel and the rear bumper beam on an extension in a rearward direction of each of the rear side frames,
• wherein a joint part, which is joined to the rear panel, of a rear end of the rear floor panel has:
• an upper side joint section that extends inward in the vehicle width direction from a vicinity of each of the rear side frames;
• and
• a lateral side joint section that extends downward from an inner end portion in the vehicle width direction of the upper side joint section and that is arranged to be separated in the vehicle width direction from each of the rear side frames,
• the rear panel has:
• a frame joint part to which rear ends of the rear side frames are joined;
• a first floor joint part to which the upper side joint section is joined;
• and
• a second floor joint part to which the lateral side joint section is joined,
• a longitudinal bead in which an expansion shape that expands in a vehicle body frontward direction or a vehicle body rearward direction extends substantially along a vertical direction is provided on a part of the rear panel between the frame joint part and the second floor joint part, and
• the longitudinal bead extends to a lower end of the rear panel and is opened downward.