An apparatus for controlling an electric oil pump that can determine the occurrence of idling even in a region in which determination based on a load of the electric oil pump becomes difficult.The apparatus for controlling an electric oil pump according to one embodiment of the invention sets a target number of revolutions for determination tNset higher than a required number of revolutions tNreq corresponding to an operation request of the electric oil pump, and executes control of an electric motor so that the number of revolutions N of the electric oil pump approaches the target number of revolutions for determination tNset. A load (phase current Ii) of the electric oil pump is detected while executing the control of the electric motor, and the occurrence of idling in the electric oil pump is determined based on a detected pump load (Inrm, IidI).