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1. A cab comprising:
a driver's seat for an operator to sit and an air conditioner in an internal space of the cab; and a floor plate forming a floor, said floor plate including a tapered portion on a front side with respect to an operator sitting on said driver's seat and a rectangular portion on a rear side with respect to the operator as seen in a plan view, said tapered portion being in a tapered trapezoidal shape having two parallel sides and a dimension in a width direction decreasing frontward, a through hole being formed in said floor plate of a region of said tapered portion and connecting said internal space of said cab and an exterior of said cab to each other so that air in the internal space of the cab where the driver's seat is disposed is released to the exterior of the cab, wherein the cab is formed so that a dimension in a height direction decreases frontward as seen in a side view, and said through hole is formed in said floor plate of a region where the dimension in said height direction decreases, the air conditioner is disposed in said internal space of said cab at a position opposite to said through hole, a first support member and a second support member support said air conditioner so that a gap is generated between said air conditioner and said floor plate, a height of each of the first and second support members being less than a distance between the first and second support members, and an area of an opening of said through hole that opens to said internal space of said cab is equal to or larger than an area of an entrance of said gap that is surrounded by said air conditioner, said first and second support members, and said floor plate.
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