PURPOSE: To facilitate the fall-down operation by installing the basic edge part of a stay between installation brackets so as to be oscillated in the longitudinal direction and to be fixed and installing a lower part supporting frame for inserting and connecting the left and right fenders on the undersurface corresponding to the installation bracket.

CONSTITUTION: Fenders 2 and 2 are arranged on the left and right sides of a driver's seat 1, and flat plate-shaped installation brackets 4 and 5 are arranged outside and inside the ceiling surface of the fender 2, and the basic edge part of a stay 6 having the upper edge part higher than the driver is installed between the installation brackets 4 and 5 in erection so as to be freely oscillated in the longitudinal direction and to be fixed. The turn-down type safe frame 13 of a transfer agricultural machine is constituted by installing a lower part supporting frame for inserting and connecting the left and right fenders 2 and 2 on the undersurface corresponding to the flat plate shaped installation brackets 4 and 5. Around a pin in the rear part, the stay 6 can be set in an 'erection attitude' A, ' horizontally laying attitude' B and an 'intermediate aslant attitude' C.