A vehicle body rear part structure for a vehicle, comprising: a rear side frame which extends in a vehicle body front-rear direction on a vehicle body rear part; a rear subframe which is disposed below the rear side frame, and extends in the vehicle body front-rear direction; a torsion beam suspension device including a pair of left and right trailing arms, which is disposed on a vehicle body rear part, and includes a torsion beam extending in a vehicle width direction; and an important safety related component which is disposed on a vehicle body rear side of the torsion beam, and is mounted on the rear subframe, wherein the rear subframe includes a front load absorbing portion and a rear load absorbing portion which extend rearwardly of a vehicle body from the important safety related component disposed on the vehicle body rear part, are disposed on a vehicle body rear side with respect to the important safety related component, and are configured to absorb a collision load when the collision load from rearwardly of the vehicle body is applied, the important safety related component includes at least one of a power generator and an electrical storage device, the rear load absorbing portion is disposed on the vehicle body rear side of the front load absorbing portion, strength of the rear load absorbing portion against compression in an axis direction is set low, as compared with strength of the front load absorbing portion, and characterized in that the rear subframe further includes a frame connecting portion which is disposed between the front load absorbing portion and the rear load absorbing portion, is connected to the front load absorbing portion and the rear load absorbing portion, and is connected to the rear side frame. a rear side frame which extends in a vehicle body front-rear direction on a vehicle body rear part; a rear subframe which is disposed below the rear side frame, and extends in the vehicle body front-rear direction; a torsion beam suspension device including a pair of left and right trailing arms, which is disposed on a vehicle body rear part, and includes a torsion beam extending in a vehicle width direction; and an important safety related component which is disposed on a vehicle body rear side of the torsion beam, and is mounted on the rear subframe, wherein the rear subframe includes a front load absorbing portion and a rear load absorbing portion which extend rearwardly of a vehicle body from the important safety related component disposed on the vehicle body rear part, are disposed on a vehicle body rear side with respect to the important safety related component, and are configured to absorb a collision load when the collision load from rearwardly of the vehicle body is applied, the important safety related component includes at least one of a power generator and an electrical storage device, the rear load absorbing portion is disposed on the vehicle body rear side of the front load absorbing portion, strength of the rear load absorbing portion against compression in an axis direction is set low, as compared with strength of the front load absorbing portion, and characterized in that the rear subframe further includes a frame connecting portion which is disposed between the front load absorbing portion and the rear load absorbing portion, is connected to the front load absorbing portion and the rear load absorbing portion, and is connected to the rear side frame.