PROBLEM TO BE SOLVED: To prevent a sprayed chemical solution from entering a cabin. SOLUTION: Left and right opening/closing doors for getting in and out of a cabin 20 are provided, and left and right opening/closing switches 70L, 70R for opening and closing the left and right opening/closing doors, left and right door motors 74L, 74R for moving the left and right opening/closing doors, and left/right opening/closing Left and right door sensors 71L and 71R that detect the open/closed state of the door, and a spray switch 72 that turns on and off the chemical spray from the control boom 40 are provided, and when the left and right door sensors 71L and 71R detect that the left and right doors are closed, The spray switch 72 is turned on to enable spraying, and when the vehicle speed sensor 120 detects forward running or backward running, the pest control pump 75 is driven to start spraying the chemical solution from the pest control boom 40. When the door is opened, the door motor that moves the opening/closing door is driven to automatically close the opening/closing door. [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を設け、左右の開閉扉を開閉させる左右の開閉スイッチ70L,70Rと、左右の開閉扉を動かす左右のドアモータ74L,74Rと、左右の開閉扉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が前進走行又は後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、走行中に開閉扉が開くと、開閉扉を動かすドアモータを駆動して開閉扉を自動で閉じるように構成したことを特徴とする自走式防除機とする。【選択図】図8