disclosed is an ultrafine fiber including lignin , a carrier polymer and a carbon material . the ultrafine fiber , which includes lignin , can exhibit the properties of lignin such as antibacterial property , biodegradability , etc . accordingly , it can be used widely in medical materials such as nanofiber , nanofiber web , nanofiber sheet , etc . for wound healing of the skin &# 39 ; s dermal layer . also , the ultrafine fiber can be used in sheath of electric cables because it contains a carbon material and has superior conductivity . in addition , because the ultrafine fiber can hold a large quantity of water , it can be used in various fields including sanitary pads for women , diapers for babies and adults , etc .