  We demonstrate a p$-wave optical Feshbach resonance (OFR) using purely
long-range molecular states of a fermionic isotope of ytterbium ^{171}Yb,
following the proposition made by K. Goyal et al. [Phys. Rev. A 82, 062704
(2010)]. The p-wave OFR is clearly observed as a modification of a
photoassociation rate for atomic ensembles at about 5 micro-Kelvins. A
scattering phase shift variation of \delta \eta=0.022 rad is observed with an
atom loss rate coefficient K=28.0*10^{-12} cm^3/s.
