Vehicle instrument panel reinforcement and a passenger seat airbag device attachment structure employing the vehicle instrument panel reinforcement are provided that are capable of securing the strength and rigidity to support for example a reaction force imparted during deployment of a passenger seat airbag device, and are also capable of achieving a reduction in both cost and weight. Instrument panel reinforcement formed with a quadrilateral shaped closed cross-section profile from an upper member and a lower member is disposed along the vehicle width direction inside a vehicle instrument panel. A circular cylinder shaped collar is disposed inside a closed cross-section portion of the upper member. A passenger seat airbag device is fastened and fixed to the instrument panel reinforcement by a bolt and weld nut, employing the collar.