To provide a fastener fixing a sheet at an optional position on site by using a sheet fastener, whereas in a sheet without processing such as eyelet for fixation or a sheet with eyelets the interval of which is determined, insufficient fixing is caused at a surplus portion or twisted portion of the sheet and the insufficient fixing is also caused at an overlapped and joined portion of such sheets.

In the fastener for pinching and fixing a sheet from both sides thereof by use of a sheet fastener, a catch holder for receiving the sheet includes a fixing button for pushing and fixing the sheet thereto, and is used to connect sheets by joining and fixing the sheets. A hook is provided on the ring-like outer circumference of the fastener so that a cord or rope can be laid at an optional position of the sheet surface, and a member for fixing the button head for pushing the sheet to the catch holder by a lock key from the inside is used in combination. Then, a strengthened faster for pinching and fixing a sheet is attained, and this fastener and the like are used to compensate for the insufficient sheet fixation.