PROBLEM TO BE SOLVED: To provide a combine-harvester enabled to prevent a second cutting blade from colliding against and being damaged by a levee and to improve an operability such as a levee crossing work needing the changeover of the supporting state of the second cutting blade.SOLUTION: A combine harvester comprises: a cutting device having a first cutting blade and a second cutting blade 133 for cutting the left culm of the first cutting blade, wherein the second cutting blade 133 is mounted on a running machine body 1 through a lefthand frame 134 and a righthand frame 135. The combine harvester further comprises: a floating support mechanism for supporting the second cutting flame 133 liftably and a floating change-over mechanism 150 for switching a coactive state, in which the cutting device and the second cutting blade 133 are integrally moved up and down, or a floating state, in which the second cutting blade 133 is independently moved up and down in no relation to the cutting device. The floating changeover mechanism 150 includes a lock body 215 for retaining the second cutting blade 133 removably in a feeder house 11 of the cutting device in association with the upward and downward movements of the cutting device.COPYRIGHT: (C)2015,JPO&INPIT【課題】第2刈刃が畔などに衝突して損傷するのを防止でき、第2刈刃の支持状態の切換が必要な畔越え作業などの操作性を向上できるようにしたコンバインを提供する。【解決手段】第1刈刃を設ける刈取装置と第1刈刃の残稈を切断する第2刈刃133を備え、左側フレーム134及び右側フレーム135を介して走行機体1に第2刈刃133を装着するコンバインにおいて、第2刈刃133を昇降可能に支持させるフローティング支持機構を備える一方、刈取装置と第2刈刃133を一体的に昇降動させる連動状態、又は刈取装置と関係なく第2刈刃133を独立的に昇降動させるフローティング状態に切換操作するフローティング切換機構150を備え、フローティング切換機構150は刈取装置の昇降動に連動して、刈取装置のフィーダハウス11に第2刈刃133を係脱可能に係止させるロック体215を有するものである。【選択図】図6
