An internal combustion engine intake device includes an intake collector
and a first air induction pipe. The intake collector includes a first
collector space and a second collector space. The first air induction
pipe extends diagonally downward from an upstream side of the intake
collector with respect to a horizontal direction of the vehicle. The
first air induction pipe includes a first air induction space and a
second air induction space. The intake collector and the first air
induction pipe are configured and arranged such that a first boundary
plane defined between the first collector space and the first air
induction space is substantially perpendicular to a direction of an
intake air flow from the first air induction space into the first
collector space and the first boundary plane is substantially coplanar
with a second boundary plane defined between the second collector space
and the second air induction space.