Provided is an acceleration pedal reaction force control device that imparts to a driver a sensation (feeling) of an appropriate reaction force in accordance for example with an intention of/operation performed by the driver. The acceleration pedal reaction force control device is configured such that when a stepping amount ([theta]) on the acceleration pedal (12) has become equal to or exceeded a threshold stepping amount ([theta]th), whether a reaction force increase rate ([increment]F/[increment]t) at which a base reaction force (Fb) increases to a target reaction force (Ftar) with the threshold stepping amount ([theta]th) should be made variable or a reaction force increase amount (enhancing reaction force) (Fp) for causing the base reaction force (Fb) to increase to the target reaction force (Ftar) with the threshold stepping amount ([theta]th) should be made variable can be set. Thereby, a sensation (feeling) of an appropriate reaction force (F) can be imparted to a driver in accordance for example with an intention of/an operation performed by the driver.