A front pillar structure includes a pillar outer. The pillar outer includes an outer side wall portion, a front side wall portion, a rear side wall portion, a rear side curved portion, and a front side curved portion. The outer side wall portion constitutes a part of the pillar outer on a side far from a vehicle width center in a width direction of a vehicle. The front side wall portion constitutes a part of the pillar outer on a front side of the vehicle. The rear side wall portion constitutes a part of the pillar outer on a rear side of the vehicle. The rear side curved portion connects the outer side wall portion and the rear side wall portion to each other. The front side curved portion connects the outer side wall portion and the front side wall portion to each other.