To make it possible to simply and effectively clamp a sheet-like matter to a wall by forming the one surface of a base in a flat surface state, forming a piercing part to protrude from the surface part, and providing an adhesive layer or sticky layer at least on the part of the flat surface part of the base.

The sheet-like matter clamper A comprises a base part 1, and a piercing part 2. The part 1 is formed of a holding part 12a and a flat surface part 1b. An adhesive layer 1c is provided on the part 1b. In the case of using, first release sheet 1d adhered to the layer 1c is released, and the layer 1c is exposed. Then, the matter is superposed on the surface of a part to be clamped such as a wall similarly to a general drawing pin, and the clamper A is pierced to clamp the matter. At that time, the matter is supported by the adherence of the layer 1c in addition to the part 2, and hence the matter is effectively clamped.