Replacement of a front end unit is facilitated which performs mowing of a crop in a cereal stalk reaping apparatus. The present invention comprises a spindle reaper (61) which is laterally bridged with respect to a body (3), and rotates in a vicinity of a horizontal axis a rotation transformation mechanism (100) which is linked and concatenated to a terminal end of the spindle reaper (61) and a transmission shaft group which is installed in a longitudinal direction of the body (3) and linked and concatenated to an output side of the rotation transformation mechanism (100) to move a cutting blade of a reaping apparatus (270) from side to side. The transmission shaft group is configured to include a first transmission rod (110) whose lead end is connected to the rotation transformation mechanism (100) and a second transmission rod (220) which rotates in conjunction with the first transmission rod (110) via a predetermined power transmission mechanism that has a shaft center different from a shaft center of the first transmission rod (110). One end of the second transmission rod (220) is linked and concatenated to one end of the cutting blade via a linear conversion mechanism to move the cutting blade of the reaping apparatus (270) from side to side.Cette invention concerne un appareil de fauchage de tiges de céréales comportant une unité terminale avant plus facile à remplacer. Linvention comprend une faucheuse à mandrins (61) rattachée latéralement à un corps (3) et pivotant à proximité dun axe horizontal un mécanisme de transformation de rotation (100) lié et enchaîné à une extrémité terminale de la faucheuse (61) et un groupe darbres de transmission situé dans le sens longitudinal du corps (3), et lié et enchaîné à la sortie du mécanisme de transformation de rotation (100) pour déplacer latéralement la lame dincision dun appareil de fauchage (270). Le groupe darbres de transmission contient une première tige de transmission (110) dont la partie avant est reliée a
