PURPOSE: To improve the mounting precision and facilitate the mounting work in a mounting structure for a fender body bonnet and a side door by integrally molding pillar side hinge parts for mounting respective hinges for mounting the side door and the fender body bonnet to hinge pillars.

CONSTITUTION: An upper pillar side hinge part 21 and a lower pillar side hinge part 22 are vertically provided on the car width directional outer side surface of a rear hinge pillar part. Vertically extending support parts 21a, 22a are provided on the rear parts of the upper and lower pillar side hinge parts 21, 22, and door side hinge part connecting parts 21a, 22b for connecting the hinge parts of a front door are provided in the rear of them. Further, a bonnet side hinge part connecting part 21c extending upward is integrally molded on the upper pillar side hinge part 21 so that a hinge part 24 on a fender body bonnet 5 side can be mounted thereon.