To provide a vehicular knee protector structure having the physique adaptive function of high level performance.

Deformation load reducing-shaped portions 22, 24 capable of reducing the deformation load on a knee protector body plate 6 when a lower bracket 4 is deformed are provided on a side part of one of an upper bracket mounting part 21 for a rear end 3a of an upper bracket 3 of the knee protector body plate 6 and a lower bracket mounting part 23 for a rear end 4a of the lower bracket 4.