COMPONENT

[PROBLEMS] An object of the present invention is to reduce an amount of oil leaking from between a catch tank portion and a tunnel portion.[SOLUTIONS] A component comprising: a first case portion having a tunnel portion having an opening end opening toward an axial direction; and a second case portion having a catch tank portion opening upward, wherein the first case portion and the second case portion face each other such that a bottom portion of the tunnel portion and a bottom portion of the catch tank portion are coupled to each other.