A front frame structure for a vehicle has a front side frame comprising a side frame portion which has a closed cross-section and is mounted on the side wall of the engine compartment on the front side of a dashboard panel to extend in the longitudinal direction of the vehicle body, and a floor frame portion which has a channel-shaped cross-section with the open portion upward, is connected to the rear end of the side frame portion by way of a junction bent by a predetermined angle in a vertical plane, and is mounted on the lower surface of a floor panel to extend in the longitudinal direction of the vehicle body. A front reinforcement is provided in the side frame portion and a rear reinforcement is provided in the floor frame portion. The front reinforcement and the rear reinforcement are connected together near the bent junction of the side frame portion and the floor frame portion. A gusset is fixed to the junction of the front reinforcement and the rear reinforcement to partition the front side frame in the longitudinal direction thereof.