| 摘要 |
PROBLEM TO BE SOLVED: To provide a structure for preventing an eraser from being lost by a method wherein a white board is enabled to be rotated, a spring is provided inside the eraser, a character written on the white board is easily erased by making the eraser movable, and the eraser is fitted inside a main body. SOLUTION: A white board 6 which is fitted to a plate 2 and integrated with a rotor 5, and an eraser 7 installed to a case body 8 fixed to a main body 1 are provided. The rotor 5 has a rotary shaft 51 for rotating the white board 6. A spring 9 for expanding and contracting the eraser 7 by rotation of the white board 6 is equipped to the case body 8.
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