  We report spin-current generation related with skyrmion dynamics resonantly
excited by a microwave in a helimagnetic insulator $\mathrm{Cu_2OSeO_3}$. A Pt
layer was fabricated on $\mathrm{Cu_2OSeO_3}$ and voltage in the Pt layer was
measured upon magnetic resonance of $\mathrm{Cu_2OSeO_3}$ to electrically
detect injected spin currents via the inverse spin Hall effect (ISHE) in Pt. We
found that ISHE-induced electromotive forces appear in the skyrmion phase of
$\mathrm{Cu_2OSeO_3}$ as well as in the ferrimagnetic phase, which shows that
magnetic skyrmions can contribute to the spin pumping effect.
