Abstract: The present invention relates to a wound covering material containing at least a hydrogel, wherein the hydrogel contains fine fibrous celluloses having ionic substituents. The present invention also relates to a method of producing the wound covering material, including a process of obtaining a hydrogel using a mixture of hydrophilic polymers and fine fibrous celluloses having ionic substituents. Accordingly, there are provided a wound covering material having excellent water retention and strength and favorable adhesiveness and peelability with respect to a living body, and a method of producing the same.