  This paper shows that a formula for the pushforward measures on the fiber
bundle $ G \to G / H $ of homogeneous space of locally compact groups $ G $ and
$ H $ can be written down by using the modular functions. As a result, we
obtain the equality \begin{align} \frac{ \Delta_G ( h ) }{ \Delta_{ G / N } ( h
N ) } = \frac{ \Delta_H ( h ) }{ \Delta_{ H / N } ( h N ) } \end{align} on the
modular functions for any closed subgroups $ N $ and $ H $ of a locally compact
group $ G $ with $ N \lhd G $ and $ N \subset H \subset G $ and any $ h \in H
$.
