  In the past few decades, some studies pointed out that magnetic field might
affect the rotation curves in galaxies. However, the impact is relatively small
compared with the effects of dark matter and the baryonic components. In this
letter, we revisit the impact of magnetic field on the rotation curve of our
Galaxy. We show that the inner Galactic rotation curve could be affected
significantly by the magnetic field. The addition of the inner bulge component,
which has been proposed previously to account for the inner rotation curve
data, is not necessary. The magnetic field contribution can fully account for
the excess of the inner rotation velocity between 5 pc to 50 pc from the
Galactic Centre. Our analysis can also constrain the azimuthal component of the
central regular magnetic field strength to $B_0 \sim 50-60$ $\mu$G, which is
consistent with the observed range.
