  The neutron energy-dependent angular distribution of $\gamma$ rays from
$^{117}{\rm Sn}(n,\gamma)$ reaction was measured with germanium detectors and a
pulsed neutron beam. The angular distribution was clearly observed in
$\gamma$-ray emissions with an energy of 9327 keV which corresponds to the
transition from a neutron resonance of $^{117}{\rm Sn}+n$ to the ground state
of $^{118}{\rm Sn}$. The angular distribution causes an angular-dependent
asymmetric resonance shape. An asymmetry $A_{\rm LH}$ was defined as $(N_{\rm
L}-N_{\rm H})/(N_{\rm L}+N_{\rm H})$, where $N_{\rm L}$ and $N_{\rm H}$ are
integrated values for lower- and higher-energy regions of a neutron resonance,
respectively. We found that the $A_{\rm LH}$ has the angular dependence of $(A
\cos \theta_\gamma +B)$, where $\theta_\gamma$ is the $\gamma$-ray emission
angle with respect to the incident neutron momentum, with $A=0.394 \pm 0.073$
and $B = 0.118 \pm 0.029$ in the 1.33 eV p-wave resonance.
