A decorative sheet and a decorative plate having both high luminance and high designability, and an inkjet ink for the decorative sheet used for producing the decorative sheet and the decorative plate. The decorative sheet according to an aspect of the present invention is provided with at least a lustrous layer which is an inkjet printed layer formed by using an inkjet ink on a base sheet, and the inkjet ink contains silver nanoparticles. The decorative plate according to an aspect of the present invention is provided with a decorative sheet and a substrate which is arranged on the side of the decorative sheet facing the substrate sheet. The inkjet ink for a decorative sheet according to an aspect of the present invention is an inkjet ink for a decorative sheet for forming a lustrous layer on a substrate sheet by an inkjet printing method, and contains silver nanoparticles.