It is an object of the present invention to provide a solidification accelerator capable of improving the solidifying property, releasing property and crystal stabilizing speed of an oil-and-fat food such as chocolate with a small amount of addition or blending so that the productivity of oil-and-fat foods can be improved.When a specific amount of a solidification promoter containing a specified amount or more of StOSt and the content of StLSt and StStO is not more than a specific amount is added or blended in a specific amount, the solidifying property, releasing property and crystal stabilizing rate of the oleaginous food are improved, As a result, the productivity of the oleaginous food can be improved.少量の添加または配合でチョコレート等油脂性食品の固化性や離型性、結晶安定化速度を改善し、その結果油脂性食品の生産性を向上できる固化促進剤を提供することを課題とする。特定量以上のStOStを含み、StLSt及びStStOの含量が特定量以下である固化促進剤を特定量添加または配合すれば、油脂性食品の固化性や離型性、結晶安定化速度が改善され、その結果油脂性食品の生産性を向上できる。