Provided is an oil or fat composition, including a vitamin B1 derivative or a salt thereof at a content of 44 to 8,000 ppm in terms of thiamine and having a hydroxyl value of 9 to 100 mg-KOH/g, in which the content C (ppm) of the vitamin B1 derivative or the salt thereof in terms of thiamine and the hydroxyl value X (mg-KOH/g) satisfy a relationship of the following expression (1):where Ln represents a natural logarithm.
