The surface tension of aqueous solution of sodium dodecyl sulfate (SDS) stayed constant by an addition of alpha-, beta-, or gamma-cyclodextrin (CD) since the 1:2 inclusion compound, SDS-2CDs, is formed. On the other hand, the addition of [Co(NH3)(6)](ClO4)(3) into an aqueous solution of the above inclusion compound shows the characteristic drawing of SDS from CDs. The easiness of the drawing is shown as gamma-CD > beta-CD > alpha-CD due to the cavity size of CDs.