To provide a car body rear part structure of an automobile capable of increasing connection rigidity of an upper side corner part of a back door opening without using an exclusive reinforcing member.
Since upper end parts of a back pillar inner 37 and a back pillar reinforcement 41 are joined by overlapping them on a lower face of a drip recessed part 48 on first horizontal join faces 49, 51 and are joined by overlapping them on a rear side wall 45c of a rear roof rail 43 on second substantially vertical join faces 50, 52, a second closed cross section 42 of a back pillar 36 and a closed cross section 46 of a rear roof rail 43 are continuous, join parts have multiple wall structures, and join strength of the join parts can be increased because the first join faces 49, 51 and the second join faces 50, 52 are continuous.
URUSHIBATA KENICHI
ANDO TOMOTAKA
