A vehicle body front part structure has an apron side panel 5 joined to an apron side member 4 extending along the vehicle longitudinal direction, and a tray 14 for battery supported on the apron side member 4. In the front part structure, a leg part 16 is provided in an tray body part 15, a lower end part 16K of the leg part 16 is fixed to the apron side member 4 with a fixing member B, and the leg part 16 is formed of a plate material so that the deformation of the apron side member 4 is allowed when a vehicle longitudinal force is applied to the apron side member 4.