A thickener which is superior in handling characteristics and blending stability
and has a high thickening action is provided, comprising a fatty acid alkanolamide
represented by the general formula (1) and a surfactant composition comprising
the thickener and at least one surfactant:
##STR1##
wherein R1 represents a straight-chain or branched alkyl or alkenyl
group having 5 to 21 carbon atoms which may be substituted with at least one hydroxy
group, R2 and R3 independently represent an alkyl group having
1 to 2 carbon atoms, AO represents an oxyalkylene group having 2 to 4 carbon atoms
and n denotes a number of 0 to 10 in average.