A vehicle body front part structure according to a first aspect of the present invention includes: a center frame which extends along a vertical direction of a vehicle, a top end flange part that bends toward a rear being formed on a top end of the center frame; and a dashboard lower which has a first vertical wall, a bent part that is bent toward the rear being formed on a top edge of the first vertical wall. The top end flange part and the bent part are joined overlapping each other, and a closed cross-section structure part is formed between the center frame and the bent part.