To increase the inner falling rigidity of a strut tower without using an exclusive strut bar, and to improve the twisting rigidity of the car body front part, by combining a cowl box striding on the upper surface of the strut tower erected to the left and the right front wheel houses.

At the position near a dash panel 1 at the shelf 4a of a hood ridge panel 4, a front wheel house 4b is swelling formed, and a strut tower 5 to connect and support the shock absorber of a front suspension is jointed and set at the central part of the front wheel house 4. And a cowl box 3 is combined striding on the upper surface of the strut tower 5. Consequently, the inner falling rigidity of the strut tower 3 can be increased by this cowl box 3 without using an exclusive strut bar.