The invention relates to a gear reducer (1) for a cockpit control device of an aircraft, the gear reducer comprising a frame (3) and a fork (5), movable in rotation relative to the frame around a fork axis (X5), the fork comprising two arms (7, 8). The gear reducer comprises two rollers (13, 15), the rollers being respectively mounted at an end (12, 14) of the arms, and a cam (21), movable in rotation relative to the frame around a cam axis (X21) parallel to the fork axis, the rollers being in rolling contact respectively with opposed sides (21 A, 21 B) of the cam, one among the fork and the cam being an input of the gear reducer, the other being an output of the gear reducer.
