An object of the present invention is to provide a radiation image conversion panel exhibiting excellent sharpness, excellent graininess and high luminance, accompanied with high aging performance. Also disclosed is a radiation image conversion panel possessing an alkali metal halide based stimulable phosphor layer formed by a vapor deposition method, provided on a support, wherein a stimulable phosphor possesses at least two kinds of halides, and a phosphor columnar crystal in the stimulable phosphor layer has a core/shell structure.