The present invention provides a softener composition containing a specific bis(polyalkoxyalkanol) type quaternary ammonium salt represented by formula (I): [wherein R1 and R2 may be the same as or different from each other and represent a hydrocarbon group having 11 to 23 carbon atoms, R3 and R4 may be the same as or different from each other and represent a hydrocarbon group having 1 to 4 carbon atoms which may have a hydroxyl group, k and l may be the same as or different from each other and represent an integer of 5 to 10 and X− represents an anion.]