Suavodrillia declivis is a species of sea snail, a marine gastropod mollusk in the family Borsoniidae.
The shell is multicarinate with a few, strong carinae. The siphonal canal is somewhat more produced and narrowed. The anal sinus is shallow. The columella is not plicate. The color of the shell is light reddish fulvous.
This species occurs in the Pacific Ocean off Japan.