PROBLEM TO BE SOLVED: To provide a fiber product having cleanliness and safety, rich in washing durability and satisfying antibacterial property and antivirus property.SOLUTION: There is provided an antibacterial and antivirus processed fiber product containing a polyester fiber of 60 wt.% or more and at least one kind of quaternary ammonium salt represented by the formula [II] or a derivative. R and R are each independently a methyl group, a cyclic alkyl group containing aromatic or alicyclic, R and R contain an aromatic cyclic alkyl group having a methylene group at one or more carbon at 2, 4 and 6 position, m, n, p and q are integers of 0 to 20 and X- is a halide ion.SELECTED DRAWING: NoneCOPYRIGHT: (C)2018,JPO&INPIT【課題】清潔且つ安全で洗濯耐久性に富む、抗菌性及び抗ウイルスを満足する繊維製品の提供。【解決手段】ポリエステル繊維を60重量%以上含む製品で、式[II]で表す少なくとも一種の第四級アンモニウム塩又は誘導体を含有する抗菌・抗ウイルス加工繊維製品。(R及びR’は各々独立にメチル基、芳香族又は脂環式を含む環状アルキル基、R及びR’は2、4、6位の炭素のいずれか1つ以上にメチレン基を有する芳香族環状アルキル基を含む;m、n、p及びqは0~20の整数;X-はハロゲン化物イオン)【選択図】なし