PURPOSE: To obtain a grain tank-attaching device in an inexpensive harvester by connecting a front frame and a rear frame to each other through a lateral frame, stably supporting the grain tank on the lateral frame, and simplifying the supporting structure, the front and rear frames being vertically disposed on a frame.

CONSTITUTION: In the harvester in which a grain tank 6 is disposed on the side of a threshing machine 4 and on a bagging section 71, a front frame 54 constituting an engine room frame 52 and a rear frame 10 supporting a discharging grain culm cutter 9 are connected to each other through a lateral frame 13. The front frame and the rear frame are vertically disposed on the front and rear parts of the frame 1a. The outside of the grain tank 6 is attached and fixed to the lateral frame 13 through an attaching member 3a, and the lateral frame is also used as a handrail.