Roughened nickel-plated sheet

A roughened nickel-plated sheet comprising a roughened nickel layer on at least one surface of a metal substrate as the outermost layer thereof, the roughened nickel layer being formed of a plurality of nickel protrusions,

• wherein when the roughened nickel-plated sheet is measured with a focused ion beam scanning electron microscope (FIB-SEM), and the structure of the roughened nickel layer is measured at height positions from images captured with the focused ion beam scanning electron microscope,
• the absolute value Crate(Ni90%_Ni50%) of the rate of the change in nickel occupancy to the change in height from a height position DNi90% with a nickel occupancy of 90% to a height position DNi50% with a nickel occupancy of 50% is 65%/μm or less,
• the nickel occupancy C2.0 at a height position located 2.0 μm from a base position of the roughened nickel layer toward the surface in the height direction is 15% or more, and
• the number N2.0 of nickel protrusions present at the height position located 2.0 μm from the base position toward the surface is 20 protrusions/136.5 μm2 or more.