To provide a front pillar structure of a vehicle, capable of suppressing the deformation of a front pillar by efficiently dispersing/transmitting a collision load from a front side to the whole of the front pillar.

A reinforce panel 60 is disposed between an inner panel 20 and an outer panel 40. A window forming portion 26 of the inner panel 20, and triangular window forming portions 56, 46 of the reinforce panel 50 and the outer panel 40 are united by a bracket 70, so that the stiffness/strength of a center in a vertical direction of the front pillar 10 is improved. The collision load from the front side is inputted to an front end 72f of a flange 72 formed on the bracket 70, transmitted from the flange 72, and transmitted to the triangular window forming portions 50, 46 of the reinforce panel 50 and the outer panel 40 through the bracket 70. The collision load is dispersed/transmitted to the whole of the front pillar 10 by the inner panel 20, the reinforce panel 50, and the outer panel 40.