A control means for an agricultural tractor is disclosed which has a switching element carrier arranged in proximity to the leading end region of an arm rest of a driver's seat. The control means has a large number of switches for controlling various vehicle units and the carrier has a hand rest (3, 4) provided with a spherical surface for the palm of the vehicle driver's hand. An adjustment wheel (14, 19) is provided for controlling a switching element (12, 24), the adjustment wheel having a setting rim (14a, 19a) which extends from the switching element carrier in a region which can be reached by the fingers of the hand resting on the hand rest (3, 4). Preferably the control means is provided with two adjustment wheels (14, 19) one above the other, each adjustment wheel having a setting rim (14a,19a) which can be reached by the fingers of a hand resting on the hand rest. These adjustment wheels (14, 19) preferably have actuating shafts (13, 23) which extend substantially coaxially and the lower adjustment wheel (14) has a larger external diameter than the upper adjustment wheel (19).