PURPOSE: To improve the rigidity of a car body, as for a car body front part structure in which an in-panel structure unit on which a cowl is previously installed is installed on a car body.

CONSTITUTION: An in-panel structure unit 12 is tightened in the through holes 50 and 52 and through holes 54 and 56 as the first joint part installed along the vertical direction on the car width direction outside wall part 42A and the car width direction inside wall part 42B of the front pillar 42 of a car body, by bolts 62 and 64 and wed nuts 39 and 41, and further, tightened with a hood stopper 24 into the through holes 80 and 78 as the second joint part with the car width direction inside wall part 66A of an aprorn upper member upper 66 and the car width direction outside wall part 68A of an apron upper member lower 68 which are separated in front of the car body from the first joint part, by a bolt 84 and a weld nut 28.