A vehicle body front section structure includes: a suspension tower; an apron upper member that extends in a vehicle front-rear direction along a top wall portion of the suspension tower, a pair of frames that are disposed to a vehicle front side and a vehicle rear side of the suspension tower, that extend from the apron upper member towards a vehicle lower side and vehicle width direction inner side, and that are integrally formed with a cast-formed suspension tower structural body together with the suspension tower and the apron upper member; a cross rib that is formed at the apron upper member and that extends along the apron upper member; and a pair of vertical ribs that are respectively formed at the pair of frames, that extend along each of the pair of frames, and that are connected to the cross rib.