A laser light irradiating system which irradiates a laser light onto a thermally reversible recording medium which is pasted on a face on one side of an object to be conveyed to perform one of image erasing and image recording is disclosed. The laser light irradiating system includes a conveying unit; a detecting unit; a laser light emitting unit; and a control unit, wherein the control unit conveys the object to be conveyed to a specific position and, when the thermally reversible recording medium is not detected by the detecting unit, the laser light with a power level greater than or equal to a predetermined power level is prevented from being emitted from the laser light emitting unit.