  Motivated by the nematic electronic fluid phase in Sr_{3}Ru_{2}O_{7}, we
develop a combined scheme of the renormalization-group method and the
random-phase-approximation-type method, and analyze orbital susceptibilities of
the (d_{xz},d_{yz})-orbital Hubbard model with high accuracy. It is confirmed
that the present model exhibits a ferro-orbital instability near the magnetic
or superconducting quantum criticality, due to the Aslamazov-Larkin-type vertex
corrections. This mechanism of orbital nematic order presents a natural
explanation for the nematic order in Sr_{3}Ru_{2}O_{7}, and is expected to be
realized in various multiorbital systems, such as Fe-based superconductors.
