PURPOSE: To permit insertion of accumulation type fluorescent material sheets into a desired housing part for sheets by providing the housing part for sheets having plural sheet housing chambers for housing the sheets by each sheet in approximately parallel and freely displaceably constituted guide means.

CONSTITUTION: Guide plates 30 constituting housing mechanisms 26, 106 delineate the housing chambers 34a, 34b for sheets together with supporting plates 28a, 28b of a stationary type. These plates are oscillated and displaced under the action of solenoids 36 to house the accumulation type fluorescent material sheets S fed by means of a 1st conveying means and a 6th conveying means 104 into the desired housing parts. The sure housing of the accumulation type fluorescent material sheets into the respective housing chambers 34a, 34b is thereby permitted simply by oscillating and displacing the guide plates 30 as partition plates.