To provide a sun visor freely detachable from a machine body and moving a sunshade part easily following a seating posture, a standing posture and a forwardly tilted posture and fixing the sunshade part in the position.

This sun visor for the working machine is obtained by connecting freely rotatable first arms 7 and 7' freely rotatable in the front and rear directions of the machine body with fulcra 6 and 6' provided on a base 5 installed on the machine body 4 in the front or rear site of a driver's seat 41 of the working machine as the center. Connecting members 14 connecting the first arms 7 and 7' and making the first arms 7 and 7' carry out parallel translation are connected to the vicinity of the tips of the first arms 7 and 7' and the connecting members 14 are connected to base parts. The sun visor for the working machine is equipped with second arms 9 and 9' vertically rotatable in the front and rear directions of the working machine with fulcra 14c and 14d provided in the connecting members 14 as the center, a pair of sunshade part mounting arms 11 connected to the tips of the second arms 9 and 9' and making the second arms 9 and 9' carry out the parallel translation and the sunshade part 12 mounted on the tip of the sunshade part mounting arms 11, and an operation handle 15 provided to the sunshade part 12 to adjust the mounting position of the sunshade part 12.