To obtain a fertilizing work machine capable of easily operating a lever to control the amount of an applied fertilizer and capable of confirming a lever-set position even from a driver's seat by disposing a transmission for controlling the amount of the applied fertilizer in a power transmission passage and attaching the lever of the transmission to a specific position.

This fertilizing work machine is used for sucking and forcibly feeding a fertilizer received in a fertilizer tank 16 disposed outside the step 17 of a vehicle frame 1 by the use of a fertilizing pump. Therein, a transmission 30 for changing the rotation rate of the fertilizing pump to control the amount of the applied fertilizer is disposed in a route for transmitting a power from the transmission for driving the fertilizer pump, and a fertilizer control lever 37 of the transmission 30 is faced between the step 17 of the vehicle frame 1 and the fertilizer tank 16. Therein, a depression 38 for placing the fertilizer control lever 37 therein is preferably formed in the fertilizer tank 16.