In a vapor cell, the relative intensities of a sensitized fluorescence I3/21 and a direct fluorescence I3/22, as a function of T (100 to 200℃), had been measured by the methods of selective stepwise excitations with a Rb lamp and a tunable CW dye laser. From these measurements, the fine-structure transition cross-section in the 7 2D states of Rb induced in collidsion with ground-state Rb atoms were determined to be σfs (7 2D5/2→72D3/2) = 4.7 × 10-13 cm2 and σfs1 (7 2D3/2→7 2D5/2)=7.0×10-13cm2 and the cross-section for transfer of excited Rb 72D-state atoms out of the doublet were also determined as σ(tr)(5/2)=0.62×10~(-13)cm~2. The calculated result for the geometrical cross-section of excited Rb72D state shows that the magnitunes of σfs and σ1fs can be described relatively well by σgeom.