A skin softener composition comprising at least one kind of hydrocarbon oil, whose hydrocarbon oil is from 90 to 100% by weight of isoparaffin content, from 0 to 10% by weight, and to the total weight of the hydrocarbon oil A skin softener composition having more than 90% biogenic carbon content.少なくとも一種の炭化水素油を含む皮膚軟化剤組成物であって、その炭化水素油は、90~100重量%のイソパラフィン含有量、0~10重量%のノルマルパラフィン含有量、および、当該炭化水素油の総重量に対して90%以上の生物起源の炭素の含有量を有する、皮膚軟化剤組成物。