To produce an acyloxyalkanesulfonate having excellent water soluble property, foaming property and stability to hard water in the absence of a consistency regulator in a high concentration.

In this method for producing an acyloxyalkanesulfonate by esterifying a fatty acid with a hydroxyalkanesulfonate, one or more kinds of fatty acids of the formula RCOOH [R represents a 5-31C branched hydrocarbon group or both of 5-31C branched and unbranched hydrocarbon groups, with the proviso that a ratio of unbranched group is ≤50 wt.%] are esterified in the presence of an esterification catalyst and in the absence of a consistency regulator while simultaneously removing water at 180-250°C.