To control reaping height of a combine which reaps grain culm vegetated on a field by a before-reaping processing part and harvests the same, which can perform surely lift control of the before-reaping processing part even when an irregularity is present in the field, and which can perform harvest work safely.SOLUTION: A combine for performing lift control of a before-reaping processing part 3 provided on a front side of a vehicle body 1 by a lift cylinder 24, comprises on left and right parts of a bottom of the before-reaping processing part 3, a left reaping height ground sensor 25L and a right reaping height ground sensor 25R. If any of the left reaping height ground sensor 25L and the right reaping height ground sensor 25R is equal to or less than a reference reaping height or more than the reference reaping height, a reaping height controller 27 outputs an intermittent drive signal to the lift cylinder 24, for lift control of the before-reaping processing part 3 to the reference reaping height.SELECTED DRAWING: Figure 4【課題】本発明は、圃場に植生する穀稈を刈取前処理部で刈り取って収穫するコンバインで、圃場に凹凸があっても刈取前処理部の昇降制御を確実に行って安全に収穫作業が行えるコンバインの刈高さ制御を行うことが課題である。【解決手段】車体１の前部に設ける刈取前処理部３を昇降シリンダ２４で昇降制御するコンバインにおいて、刈取前処理部３の底部左右にそれぞれ左刈高さ接地センサ２５Ｌと右刈高さ接地センサ２５Ｒを設け、左刈高さ接地センサ２５Ｌおよび右刈高さ接地センサ２５Ｒのいずれかが基準刈高さ以下或いは以上を検出した場合に刈高さ制御装置２７から昇降シリンダ２４に断続駆動信号を出力して、刈取前処理部３を基準刈高さに昇降制御することを特徴とするコンバインとする。【選択図】図４
