A car body structure includes a roof side rail and a front pillar, and the roof side rail and the front pillar include a roof side rail reinforcement and a front pillar reinforcement. The roof side rail reinforcement extends in a front-to-rear direction of a car body, and the front pillar reinforcement extends in a direction that intersects the front-to-rear direction of the car body. The roof side rail reinforcement and the front pillar reinforcement are connected to each other so that an end of a lower side wall of the roof side rail reinforcement abuts an end of the outer side wall of the front pillar reinforcement in the front-to-rear direction of the car body and an end of an upper side wall of the roof side rail reinforcement overlaps an end of an inner side wall of the pillar front pillar reinforcement.