PROBLEM TO BE SOLVED: 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.SOLUTION: 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.
