To solve problems that when installing a construction blackboard at a treacherous foothold, a construction technician often drops and loses a chalk and a blackboard eraser for use in writing from a box attached to the back face of the blackboard, he/she puts the chalk and the blackboard eraser in a pocket, however, the chalk is fragile and chalk powder of the blackboard eraser is stuck to the pocket inside, which is hard to remove by washing, and on rainy days, the chalk and the blackboard eraser are wet and become unusable.

This case for storing the chalk and the blackboard eraser is provided with a lid at the upper part and prevents the intrusion of rain by closing the lid via a hook-and-loop fastener, the back face of the case body is stuck with a hook-and-loop fastener, a hook-and-loop fastener having opposite faces forming a pair of male/female faces corresponding to the hook-and-loop fastener is stuck to, for example, clothes, and the case body is fixed to the clothes with both hook-and-loop fasteners to facilitate carrying.