PROBLEM TO BE SOLVED: To provide a fat composition with a low trans acid content, suitable as sandwich cream or the like, having a flavor (sweetness, richness and full-bodied taste), hardness characteristics (tightness and rebound), and appearance (gloss and load bearing) equivalent to those of a cream with a high trans acid content and a foamable oil-in-water type emulsion composition and a whip cream using the fat composition.SOLUTION: A fat composition with a low trans acid content has an Avrami index in the range of 1.4 to 2.6 isothermally at a fat temperature of 0°C or 5°C, and an Avrami index in the range of 2.0 to 3.1 isothermally at a fat temperature of 10°C or 15°C, with a ratio of unsaturated fatty acid to saturated fatty acid (unsaturated fatty acid/saturated fatty acid) in the constituent fatty acids of the fat being in the range of 0.25 to 0.55.
