Abstract: An eraser device comprising a thin flat rubberlike erasing material and a stiff plastic holder structure therefor, the latter having a trough shape holder bottom locking together by snap clips with an inverted trough shape front cover and an inverted trough shape rear cover so as to form a clamping front end and a rear storage space. The thin flat eraser is clamped firmly at the front end so as to eliminate requirement of exerting extra force or paying special attention to the holder in order to prevent the eraser from slipping backward in the erasing operation. Additionally, the holder structure provides a smooth surface for comfortably grasping the eraser device in the hand. As the eraser front end is worn in use, it can be easily adjusted to maintain the proper protrusion by releasing the clamp action of the front cover. Refilling of long flexible thin eraser can be easily accomplished by removal of both front and rear covers.