To provide a controller for a motor pump, which supplies hydraulic oil to a vehicle drive line, capable of appropriately setting a current limit value for heat resistance while suppressing information data volume to a motor drive circuit of the motor pump.

A current limit value of a motor is stored at every continuous driving time of a motor pump on the basis of an oil temperature rising characteristic corresponding to the continuous driving time and a required motor current at each oil temperature, a driving time during driving the motor pump is integrated, the current limit value stored based on the driving time integrated value is calculated, and a motor current is limited by the current limit value.