PROBLEM TO BE SOLVED: To provide a vehicle body rear part structure which can make a wheelchair get on/off in a state that one of seats at left and right both sides is accommodated in a seat accommodation recess.SOLUTION: A vehicle body rear part structure 10 comprises: a rear opening part 14 formed at a rear part 12 of a vehicle body 11； a seat accommodation recess 22 which is formed at a rear floor 31, and bulged downwardly； a third-row seat unit 24 which can be accommodated in the seat accommodation recess 22； and a slope 43 which is supported so as to be turnable between an accommodation state and a deployment state. In the seat unit 24, a wide-width seat 33 is formed wider than a narrow-width seat 34 in width by being divided by the wide-width seat 33 and the narrow-width seat 34. The slope 43 is formed at a position which is offset to the wide-width seat with respect to a center of a vehicle width direction.SELECTED DRAWING: Figure 9
