An engine control apparatus for a work vehicle having a cooling fan or an auxiliary device driven by an engine. The engine control apparatus is capable of operating the work vehicle with the importance placed either on amount of work or fuel economy depending on the situation, and preventing the input of excessive traveling horsepower (or working horsepower), regardless of a selected work mode, to ensure durability of the traveling power train (or work machine drive equipment). Upon selection of a work mode by the work mode selection switch, a controller controls the engine to obtain a power curve selected from those selectable for the selected work mode can be obtained, based on the coolant temperature range and the selected work mode, so that the input torque transmitted to the traveling power train does not surpass the upper limit for the input torque (rated output).