top portion of the pair of side frames 9 a a bucket 29 vertically swingably attached to the front ends of the pair of arms 21 and a raising and lowering cylinder 23 for raising and lowering each of the arms 21 the arm 21 includes a straight portion 21 a that extends from the top portion of the side frame 9 a towards the front of the vehicle and a curved portion 21 b that gradually curves downwards progressively from the end portion of the straight portion 21 a and the straight portion 21 a and the curved portion 21 b are integral a step portion 21 c is formed extending downwards between the front end of the straight portion 21 a and the base end of the curved portion 21 b an end portion of the rod part of the raising and lowering cylinder 23 is swingably connected to the straight portion 21 a and the cylinder tube end portion of the raising and lowering cylinder 23 is swingably connected to the side frame 9 a therefore when the raising and lowering cylinder 23 extends and contracts the arm 21 is raised and lowered the arms 21 are in the storage state when the arms 21 are lowered to the front of the vehicle extending in the front rear direction and with the bucket 29 tilted towards the front of the vehicle and in contact with the ground a strengthening member 25 is fitted between the curved portions 21 b of the pair of arms 21 extending in the left right direction the reinforcing member 25 is located to the front of the vehicle 10 when the arms 21 are in the storage state the base end.