PROBLEM TO BE SOLVED: To solve a problem of a combine harvester comprising darkness and poor visibility in a grain tank.SOLUTION: The combine harvester is provided with a drivers seat 4 at a front side of the grain tank 7, an upper part of a front sidewall 21 of the grain tank 7 is formed as an upper inclined face 24 lifting backward, the upper inclined face 24 has a front transparent inspection lid 25 which is partially or entirely made of a transparent material, a working lamp 26 is placed at a back of the drivers seat 4 to incise a light beam through the front transparent inspection lid 25 into the grain tank 7, an upper end of the upper inclined face 24 is connected with a front part of a ceiling member 22 of the grain tank 7, the ceiling member 22 is inclined to raise the front side and lower the rear side, and an upper transparent inspection lid 28 which is partially or entirely made of a transparent member is openably placed at a prescribed position of the ceiling member 22.COPYRIGHT: (C)2011,JPO&INPIT【課題】グレンタンク内は暗く視認性が低い。【解決手段】グレンタンク7の前側に操縦部4を設け、前記グレンタンク7の前側壁21の上部を後上がり傾斜する上部傾斜面24に形成し、該上部傾斜面24には一部または全体を透明部材で形成した前側透明点検蓋25を設け、前記操縦部4の後面部には光が前記前側透明点検蓋25からグレンタンク7内に差し込むように作業灯26を設け、前記上部傾斜面24の上端には前記グレンタンク7の天井部材22の前側部分を接続し、該天井部材22は前側を高く、後側を低く傾斜させて形成し、該天井部材22の所定位置には一部または全体を透明部材で形成した上側透明点検蓋28を開閉自在に設けたことを特徴とするコンバイン。【選択図】図1