There is provided an apparatus for erasing noise in a stimulable phosphor sheet used for a radiation image recording and reproducing system in which a radiation image is once recorded on the phosphor sheet and then read out and reproduced to a visible image. The apparatus comprises an erasing light source (18) emitting light of wavelength mainly within the range of 400nm to 600nm, a loader for carrying the phosphor sheet to a position at which the phosphor sheet faces the erasing light source (18), a holder for holding the phosphor sheet in said position, and an unloader for carrying the phosphor sheet out of said position. The erasing light source (18) may be a fluorescent lamp, a laser source, an Na lamp, and Ne lamp, a metal halide lamp or an Xe lamp. The erasing light source (18) preferably comprises a plurality of aperture type white fluorescent lamps positioned parallel with one another along an inclined plane with the phosphor sheet during the noise erasing step being moved upwards along a direction parallel to the said inclined plane.