  Although a large number of astronomical craters are actually produced by the
oblique impacts onto inclined surfaces, most of the laboratory experiments
mimicking the impact cratering have been performed by the vertical impact onto
a horizontal target surface. In previous studies on the effects of oblique
impact and inclined terrain, only one of the impact angle $\varphi$ or target
inclination angle $\theta$ has been varied in the experiments. Therefore, we
perform impact-cratering experiments by systematically varying both $\varphi$
and $\theta$. A solid projectile of diameter $D_{\rm i}=6$~mm is impacted onto
a sand surface with the range of impact velocity $v_{\rm
i}=7$--$97$~m~s$^{-1}$. From the experimental result, we develop scaling laws
for the crater dimensions on the basis of $\Pi$-group scaling. As a result, the
crater dimensions such as cavity volume, diameter, aspect ratio, and
depth-diameter ratio can be scaled by the factors $\sin \varphi$ and $\cos
\theta$ as well as the usual impact parameters ($v_{\rm i}$, $D_{\rm i}$,
density of projectile, and surface gravity). Finally, we consider the possible
application of the obtained scaling laws to the estimate of impact conditions
(e.g., impact speed and impact angle) in natural crater records.
