A fiber for contact cold sensation having on a surface a polyacetal copolymer comprising oxymethylene unit(s) and oxyalkylene unit(s) represented by the general formula below, wherein the fiber is a single-layer fiber of the polyacetal copolymer, wherein the fiber has a sinsle filament fineness, determined by the method disclosed in the description, of not more than 2.5 dtex, wherein the polyacetal copolymer contains 0.2 to 5.0% by mole of the oxyalkylene unit(s), based on total moles of the oxymethylene unit(s) and oxyalkylene unit(s), wherein the polyacetal copolymer has a degree of orientation of molecular chains determined by the method disclosed in the description of at least 80%, and wherein a cloth comprising the fiber has a heat retention rate, determined by the method disclosed in the description, of not more than 10%, as measured in accordance with JIS L 1096 A method, and defined by the equation below: wherein each of R 0 and R 0 ' represents a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, an organic group having an alkyl group having 1 to 8 carbon atoms, a phenyl group, or an organic group having a phenyl group, and a plurality of R 0 s and R 0 's are the same or different, and m represents an integer of 2 to 6, Heat retention rate % = 1 − C / D × 100 wherein C represents the quantity of heat per unit surface area, which is dissipated within a period of 2 hours from a hot plate set to a temperature of 36±0.5°C when the cloth comprising the fiber is placed on the hot plate; and D represents the quantity of heat per unit surface area, which is dissipated within a period of 2 hours from a hot plate set to a temperature of 36±0.5°C when the cloth comprising the fiber is not placed on the hot plate. wherein the fiber is a single-layer fiber of the polyacetal copolymer, wherein the fiber has a sinsle filament fineness, determined by the method disclosed in the description, of not more than 2.5 dtex, wherein the polyacetal copolymer contains 0.2 to 5.0% by mole of the oxyalkylene unit(s), based on total moles of the oxymethylene unit(s) and oxyalkylene unit(s), wherein the polyacetal copolymer has a degree of orientation of molecular chains determined by the method disclosed in the description of at least 80%, and wherein a cloth comprising the fiber has a heat retention rate, determined by the method disclosed in the description, of not more than 10%, as measured in accordance with JIS L 1096 A method, and defined by the equation below: wherein each of R 0 and R 0 ' represents a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, an organic group having an alkyl group having 1 to 8 carbon atoms, a phenyl group, or an organic group having a phenyl group, and a plurality of R 0 s and R 0 's are the same or different, and m represents an integer of 2 to 6, Heat retention rate % = 1 − C / D × 100 wherein C represents the quantity of heat per unit surface area, which is dissipated within a period of 2 hours from a hot plate set to a temperature of 36±0.5°C when the cloth comprising the fiber is placed on the hot plate; and D represents the quantity of heat per unit surface area, which is dissipated within a period of 2 hours from a hot plate set to a temperature of 36±0.5°C when the cloth comprising the fiber is not placed on the hot plate.