A highly white and highly moisture absorptive and desorptive fibrous structure where a moisture absorptive and desorptive synthetic fiber having a saturated index of moisture absorption of 10% by weight or more at 20.degree. C. and 65% RH is blended, characterised in that, degree of whiteness of said fibrous structure in terms of indication method described in JIS Z 8729 is that L* is 90 or more, a* is within a range of .+-.2 and b* is within a range of .+-.10 and durability of whiteness degree against washing after washing for ten times is class 3-4 or higher.