The present invention relates to a cosmetic composition for keratin fibers comprising: (a) at least one liquid fatty component (b) at least one solid fatty component (c) at least one nonionic surfactant having an HLB value of 12 to 17 (d) at least one amphoteric surfactant and (e) at least one oxidizing agent, wherein the total amount of the (a) liquid fatty component ( s ) and the (b) solid fatty component (s) is 30 to 60% by weight relative to the total weight of the composition, the weight ratio of the amount of the (a) liquid fatty component (s) /the amount of the (b) solid fatty component (s) is 3 or less, the amount of the (b) solid fatty component (s) is 10 to 20% by weight relative to the total weight of the composition, and the amount of the (c) nonionic surf actant (s) having an HLB value of 12 to 17 is 0.01 to 2.5% by weight relative to the total weight of the composition. The present invention is useful because the oxidative cosmetic composition according to the present invention has improved quality while maintaining good cosmetic performance, for example, effective coloring or bleaching or perming, of the cosmetic composition for keratin fibers such as hair, particularly without causing another odor and exceeding safety limits.La présente invention concerne une composition cosmétique pour fibres de kératine comprenant les éléments suivants : (a) au moins un composant gras liquide (b) au moins un composant gras solide (c) au moins un tensioactif non ionique possédant une valeur HLB allant de 12 à 17 (d) au moins un tensioactif amphotère et (e) au moins un agent doxydation. La quantité totale du ou des (a) composants gras liquides et du ou des (b) composants gras solides représente entre 30 et 60 % en poids par rapport au poids total de la composition. Le rapport pondéral entre la quantité du ou des (a) composants gras liquides et la quantité du ou des (b) composants gras solides est égal ou inférieur à 3. La quantité du ou des (b) composants gras so
