To solve such problems with a conventional spraying machine that the speed of an engine and the speed of a continuously variable transmission cannot be set arbitrarily since the ratio of the speed of the engine to the speed of the continuously variable transmission is set constant, and a traveling speed cannot be matched to the rotational speed of a spraying machine since the rotational speed of the spraying machine is in proportional to the speed of the engine when another working machine such as a rotary cultivator is installed on the spraying machine to lower an operability and a workability.

This spraying machine comprises a traveling frame having a chemical tank 24, a spraying pump 4, and a nozzle 23 for spraying chemical and an automatic transmission control mechanism for interlockingly control the speed ratio V of the continuously variable transmission 21 based on the rotational speed V of the engine 9. The machine also comprises a means 142 for releasing an interlocked control between the speed ratio of the continuously variable transmission and the speed of the engine so that the speed ratio of the continuously variable transmission and the speed of the engine can be set up individually.