To provide a photostimulable phosphor sheet punching method capable of, when a photostimulable phosphor sheet with a photostimulable phosphor layer formed on a flexible support is punched, punching it without resultant foreign matter attaching to the photostimulable phosphor layer again and being easy to use.

The photostimulable phosphor sheet punching method, in which a punching tool is applied to a flexible support side of the photostimulable phosphor sheet with the photostimulable phosphor layer formed on the flexible support, is characterized in that the photostimulable phosphor sheet has a strippable layer on the photostimulable phosphor layer.