An active knee bolster (28) and a knee bolster (42), whose accommodated positions are different, are mounted within an instrument panel (18) along a curved configuration of a wall portion (24) of the instrument panel (18) which, in a vehicle transverse direction, is convex and concave in a vehicle body longitudinal direction. At a time of a vehicle body collision, a main body (30) of the active knee bolster (28) moves from an accommodated position to a leg restraining position, and a leg restraining position of the active knee bolster (28) and a leg restraining position of the fixed-type knee bolster (42) become equal positions in the vehicle body longitudinal direction. In accordance with this invention, legs of an occupant can be reliably protected, and degrees of freedom in designing a vehicle interior wall such as the instrument panel or the like are improved.