| 摘要 |
An ad device having a changing board including a plurality of flaps, which can express at least two advertisements to the front and behind faces of the plurality of ad flaps. The plane figure of each ad flap is an isosceles triangle. A supporting step is provided to make the changing board flat when the ad flaps are overlapped with neighboring ad flaps in an edge portion. An additional board may be provided to show another advertisement when the flaps are vertical stands. Accordingly, it is possible to maintain more exactly the horizontal state and the vertical state of the ad device and it is possible to prevent dust or foreign substances from entering into the ad device by having no gap between ad flaps.
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