To open up wider applications by imparting functionality and shape stability including wet heat buildup properties of a cellulosic fiber material without using a toxic agent such as formalin according to a method without causing environmental problems and improving and raising comfortableness to wear and washability and to provide the cellulosic fiber material having improved functionality and shape stability fit for the object thereof.

The method for producing the modified cellulosic fiber material includes reacting a cellulosic fiber material with an aminoethylating agent and then reacting the resultant material with a cationizing agent or simultaneously reacting the cellulosic fiber material with the aminoethylating agent and the cationizing agent.