A modified fiber fabric obtainable by polymerizing a component (X) which is a water-soluble eggshell membrane powder, a component (A) which is a bifunctional monomer represented by the following formula (1), a component (B) which is a monomer containing any one of a hydroxyl group, carboxyl group, amino group, sulfonic acid group, and phosphoric acid group, and a component (C) which is a monomer containing at least one aziridine group, or a water-soluble polymer containing a polycarbodiimide group, polyethyleneimine group, or oxazoline group, on a fiber fabric, wherein R represents any one of and —CnH2n— (n is an integer of 1 to 6); Z is a hydrogen atom or a methyl group; a and b are integers where “a+b” is 0 to 50; x and y are integers where “x+y” is 0 to 30; and “a+b+x+y” is 10 or more.