To provide a sheet (decorative sheet for wood flameproofing) used for flameproofing a combustible wooden plate while decorating, and to provide a flame-retardant wooden decorative board decorated and flameproofed using the decorative sheet.

The decorative sheet for wood flameproofing is characterized using a sheet comprising laminating a decorative layer formed of a lime-containing composition with the thickness of ≤200 μm on the surface of a copper foil having a thickness of at least 5 μm through an adhesive layer and a sheet-like substrate. The combustible wooden plate can be flameproofed while decorating by attaching the above sheet thereto.