Provided is a construction machine including an air cleaner having a cylindrical outer peripheral surface and an air intake pipe, wherein the assembly of the air cleaner and the air intake pipe can have a reduced width size in the front-rear direction. The air intake pipe has a returning portion and a downstream-side portion. The downstream-side portion has a cross section having a shape including a hypotenuse portion inclined toward the air cleaner, arranged in the state where at least a part of the hypotenuse portion is located in a space defined between the cylindrical outer peripheral surface of the air cleaner and an air-cleaner placement surface.