  Transverse single spin asymmetry, $A_{N}$, of very forward $\pi^{0}$
production from polarized $p + p$ collisions provides new information toward an
understanding of its production mechanism. $A_{N}$ of forward $\pi^{0}$ in the
pseudorapidity region of $3 < \eta < 4$ has been described by the partonic
structure of the proton in the perturbative QCD framework. However, recent data
indicates a potential contribution from not only partonic but also diffractive
interactions. In order to provide a new insight on the origin of the $A_{N}$,
we measured the very forward $\pi^{0}$ production in the pseudorapidity region
of $6 < \eta$ from $\sqrt{s}$ = 510 GeV polarized $p + p$ collisions at RHIC in
2017. We report our measurement of the very forward $\pi^{0}$ over the
transverse momentum range of $0 < p_{T} < 1$ GeV/$c$ and the preliminary
result.
