A suspension subframe is secured to an insert member embedded in a core material of an inclined wall of a dash panel. The core material is formed from corrugated plate having a multiplicity of concave-convex portions extending in the fore-and-aft direction. One apex of the insert member is oriented in the vehicle width direction, and two sides of the insert member, proximate the apex, abut against the core material. When a load in the vehicle width direction is inputted from the suspension system into the subframe, it is possible, by absorbing the load by dispersing it from the two sides sandwiching the apex of the insert member toward the core material of the inclined wall of the dash panel, to enhance the support rigidity of the subframe with respect to the inclined wall of the dash panel without excessively complicating the structure of the insert member.