PROBLEM TO BE SOLVED: To freely move a boom spraying apparatus within a storage place to easily lock the boom spraying apparatus and to allow the apparatus to be smoothly connected to a tractor without an assistant operator.SOLUTION: A boom spraying apparatus 1, which is directly mounted to a tractor, includes a tank 2, a pump 3, a machine frame 10, and a boom mechanism 5. The machine frame 10 has at its front 10A a connection portion 11 (11A, 11B) for connection to a connection assisting coupler attached to a three-point link hitch of the tractor. A support leg 6 for supporting the machine frame 10 upright in a forwardly inclined attitude is provided at the lower portion 10B of the machine frame 10. The support leg 6 has a longitudinally extending frame 60. A wheel 61 is provided at the rear end portion of the frame 60 and a grounded portion 62 is provided at the front end portion of the frame 60. A handle 7 for raising the grounded portion 62 and moving the machine frame 10 by means of the wheel 61 is provided at the front portion 10A of the machine frame 10.
