  In this paper, we prove Hardy-Leray inequality for three-dimensional
solenoidal (i.e., divergence-free) fields with the best constant. To derive the
best constant, we impose the axisymmetric condition only on the swirl
components. This partially complements the former work by O. Costin and V.
Maz'ya \cite{Costin-Mazya} on the sharp Hardy-Leray inequality for axisymmetric
divergence-free fields.
