Patented is a vehicle interior trim component made of a substrate with a groove portion with a bottom. The groove portion has a plurality of bottomed groove portions and a plurality of cutout groove portions. The cutout groove portions comprise portions of the groove portion with the bottom of the groove portion cut out. A trim member has a first cover portion. A second cover portion and a fixing member are mounted on a boundary portion between the first cover portion and the second cover portion. The trim member covers the substrate and the boundary portion including the fixing member is attached to the groove portion by longitudinal insertion through one end of the groove portion. Each of the cutout groove portions is provided on its edge with a retainer for retaining the fixing member. The fixing member comprises a retainer engagement portion that engages the retainer to fix the trim member to the substrate, and wherein the retainer engagement portion is shorter than a distance between the retainer and the bottom of the groove portion.