A water/oil resistant composition having a fluorinated copolymer dispersed or dissolved in a medium, wherein the fluorinated copolymer is one having some or all of -N(R 5)(R 6) in a fluorinated copolymer comprising from 50 to 98 mass% of structural units based on the following monomer (a) and from 2 to 50 mass% of structural units based on the following monomer (b), converted to form a salt with an organic acid comprising an organic acid having a pKa of from 2.0 to 4.0, which is at least one member selected from the group consisting of lactic acid, citric acid, malic acid and itaconic acid; Monomer (a): a compound represented by the following formula: (Z-Y) n X wherein Z is a C 1-6 polyfluoroalkyl group or a group represented by the following formula, Y is a bivalent organic group or a single bond, n is 1 or 2, and X is any one of groups represented by the following formulae to when n is 1, or any one of groups represented by the following formulae to when n is 2, C m F 2m-1 O(CF 2 CF(CF 3)O) d CF(CF 3)- wherein m is an integer of from 1 to 6, and d is an integer of from 1 to 4, - C =CH 2 - C OC =CH 2 - OC C =CH 2 - OCH 2 -φ-C =CH 2 - OCH=CH 2 wherein R is a hydrogen atom, a methyl group or a halogen atom, and φ is a phenylene group, - CH[-(CH 2) p C =CH 2]- - CH[-(CH 2) p C OC =CH 2]- - CH[-(CH 2) p OC C =CH 2]- - OC CH=CHC O- wherein R is a hydrogen atom, a methyl group or a halogen atom, and p is an integer of from 0 to 4, Monomer (b): a compound represented by the following formula: CH 2 =C(R 4)C O-Q-N(R 5)(R 6) wherein R 4 is a hydrogen atom or a methyl group, Q is a group having one, some or all of hydrogen atoms in a C 2-3 alkylene group, substituted by hydroxy groups, or a C 2-4 alkylene group, and each of R 5 and R 6 which are independent of each other, is a benzyl group or a C 1-8 alkyl group, or R 5 and R 6 are bonded to form a morpholino group, a piperidino group or a pyrrolidinyl group together with the nitrogen atom. Monomer (a): a compound represented by the following formula: (Z-Y) n X wherein Z is a C 1-6 polyfluoroalkyl group or a group represented by the following formula, Y is a bivalent organic group or a single bond, n is 1 or 2, and X is any one of groups represented by the following formulae to when n is 1, or any one of groups represented by the following formulae to when n is 2, C m F 2m-1 O(CF 2 CF(CF 3)O) d CF(CF 3)- wherein m is an integer of from 1 to 6, and d is an integer of from 1 to 4, - C =CH 2 - C OC =CH 2 - OC C =CH 2 - OCH 2 -φ-C =CH 2 - OCH=CH 2 wherein R is a hydrogen atom, a methyl group or a halogen atom, and φ is a phenylene group, - CH[-(CH 2) p C =CH 2]- - CH[-(CH 2) p C OC =CH 2]- - CH[-(CH 2) p OC C =CH 2]- - OC CH=CHC O- wherein R is a hydrogen atom, a methyl group or a halogen atom, and p is an integer of from 0 to 4, - C =CH 2 - C OC =CH 2 - OC C =CH 2 - OCH 2 -φ-C =CH 2 - OCH=CH 2 - CH[-(CH 2) p C =CH 2]- - CH[-(CH 2) p C OC =CH 2]- - CH[-(CH 2) p OC C =CH 2]- - OC CH=CHC O- Monomer (b): a compound represented by the following formula: CH 2 =C(R 4)C O-Q-N(R 5)(R 6) wherein R 4 is a hydrogen atom or a methyl group, Q is a group having one, some or all of hydrogen atoms in a C 2-3 alkylene group, substituted by hydroxy groups, or a C 2-4 alkylene group, and each of R 5 and R 6 which are independent of each other, is a benzyl group or a C 1-8 alkyl group, or R 5 and R 6 are bonded to form a morpholino group, a piperidino group or a pyrrolidinyl group together with the nitrogen atom.