  We consider a single vortex in a superfluid Fermi gas in the BCS-BEC
crossover regime near a Feshbach resonance. The effect of the molecular
Bose-Einstein condensate upon the vortex structure is discussed within the mean
field approximation at zero temperature. Using the self-consistent
Bogoliubov-de Gennes equation of the fermion-boson coupled model, we calculate
density distributions of atoms and molecules. As the number of the molecules
increases, both atomic and molecular density changes from BCS-like distribution
to BEC-like. We also study the change of the vortex core size in the crossover
regime.
