PROBLEM TO BE SOLVED: To prevent a sprayed chemical solution from entering a cabin. SOLUTION: Left and right opening/closing doors 25L, 25R for getting in and out of a cabin 20 are provided, left and right opening/closing switches 70L, 70R for opening and closing the left and right opening/closing doors 25L, 25R, and left and right moving doors 25L, 25R for moving The door motors 74L and 74R, the left and right door sensors 71L and 71R that detect the open/closed states of the left and right open/close doors 25L and 25R, and the spray switch 72 that turns the chemical spray on and off from the control boom 40 are provided. When the left and right door sensors 71L and 71R detect that the door is closed, the spray switch 72 is turned on so that spraying is possible. When the vehicle speed sensor 120 detects forward traveling, the pest control pump 75 is driven to remove chemical liquid from the pest control boom 40. The self-propelled control machine is characterized by being configured to start spraying. [Selection diagram] Figure 8【課題】キャビン内に噴霧状態の薬液が入らないようにすることを課題とする。【解決手段】キャビン20内に乗降する左右の開閉扉25L,25Rを設け、左右の開閉扉25L,25Rを開閉させる左右の開閉スイッチ70L,70Rと、左右の開閉扉25L,25Rを動かす左右のドアモータ74L,74Rと、左右の開閉扉25L,25Rの開閉状態を検出する左右のドアセンサ71L,71Rと、防除ブーム40から薬液散布を入り切りする散布スイッチ72を設け、左右の開閉扉25L,25Rが閉じていることを左右のドアセンサ71L,71Rが検出すると、散布スイッチ72を入りにして散布可能な構成とし、車速センサ120が前進走行を検出すると防除ポンプ75を駆動して防除ブーム40から薬液の散布を開始する構成としたことを特徴とする自走式防除機とする。【選択図】図8