A radiation image storage panel has a phosphor layer composed of energy-storing phosphor particles and a polymer binder and satisfies the following conditions; T1×d≧660; T2×d≧660; D≧3.4 [T1 is a transmittance (%) of the phosphor layer at a peak wavelength of a stimulation spectrum of the phosphor particles; T2 is a transmittance (%) of the phosphor layer at a peak wavelength of a stimulated emission spectrum of the phosphor particles; d corresponds to a value of 10,000×W/p (W is a weight of the phosphor particles in a unit area of the phosphor layer expressed by mg/cm2 and ρ is a density of the energy-storing phosphor expressed by g/cm3]; and D is a density of the energy-storing phosphor particles contained in the phosphor layer expressed by g/cm3].