The present invention provides an antitetanus agent containing sasa extract, an antifungal agent containing sasa extract and organic acid, an antiviral agent containing sasa extract, an antimicrobial agent containing sasa tannin, and an antimicrobial composition containing sasa extract and organic acid.本發明係關於含有矮竹(Sasa)萃取物之抗破傷風菌劑,含有矮竹萃取物及有機酸之抗黴菌劑,含有矮竹萃取物之抗病毒劑,含有矮竹單寧之抗菌劑以及及含有矮竹萃取物及有機酸之抗菌性組成物。