PROBLEM TO BE SOLVED: To provide a corn harvesting machine having little possibility of damaging an upper cover in a harvesting device.SOLUTION: The corn harvesting machine includes: a separation rotary body 30 for separating corn bunch-like bodies from standing culm a conveyance device 31 for conveying the separated corn bunch-like bodies toward a car body rearward an upper cover 32 that opens a passage area through which the standing culm subject to harvesting can pass and covers the upper parts of the separation rotary body 30 and the conveyance device 31 and a cover support frame 85 for supporting the upper cover 32. The upper cover 32 has a tapered grass-dividing operation part 76, and a cover body 77 continuously connected from the back of the grass-dividing operation part 76. The cover support frame 85 extends across the grass-dividing operation part 76 and the cover body 77, while supporting each of the grass-diving operation part 76 and the cover body 77.COPYRIGHT: (C)2015,JPO&INPIT【課題】収穫処理装置における上部カバーが損傷するおそれが少ないトウモロコシ収穫機を提供する。【解決手段】植立茎稈からトウモロコシ房状体を分離させる分離用回転体30と、分離したトウモロコシ房状体を車体後方に向けて搬送する搬送装置31と、収穫対象となる植立茎稈が通過可能な通過領域を開放し且つ分離用回転体30及び搬送装置31の上方を覆う上部カバー32と、上部カバー32を支持するカバー支持フレーム85とを備え、上部カバー32が先細状の分草作用部76とその後部に連なるカバー本体部77とを備え、カバー支持フレーム85が、分草作用部76及びカバー本体部77の夫々を支持する状態で、分草作用部76とカバー本体部77とにわたって延設されている。【選択図】図10