A fluid supply device for a drive mechanism that includes a drive source, and a drive device which is driven by the drive source and which includes a first supply target section where supply of fluid of an amount corresponding to the driving of the drive source is required, and a second supply target section where supply of fluid at a prescribed pressure or above is required, the fluid supply device supplying fluid to the first supply target section and the second supply target section, and comprising: a first supply pump which is driven by the drive source and is capable of supplying discharged fluid to the first supply target section, as well as to the second supply target section; an electric motor; a second supply pump which is driven by the electric motor and raises the pressure of a portion of the fluid discharged from the first supply pump and supplies the fluid to the second supply target section; and motor drive control means for controlling driving of the electric motor, wherein the motor drive control means is configured to implement control to: drive the second supply pump by the electric motor to raise the pressure of a portion of the fluid discharged from the first supply pump to the prescribed pressure or above by using the second supply pump, and supply the fluid to the second supply target section, when the pressure of the fluid discharged from the first supply pump and supplied to the first supply target section is less than the prescribed pressure; and stop the driving of the second supply pump by the electric motor, when the pressure of the fluid supplied to the first supply target section is equal to or greater than the prescribed pressure, characterized by the motor drive control means for controlling driving of the electric motor on the basis of the pressure of the fluid discharged from the first supply pump and supplied to the first supply target section. a first supply pump which is driven by the drive source and is capable of supplying discharged fluid to the first supply target section, as well as to the second supply target section; an electric motor; a second supply pump which is driven by the electric motor and raises the pressure of a portion of the fluid discharged from the first supply pump and supplies the fluid to the second supply target section; and motor drive control means for controlling driving of the electric motor, wherein the motor drive control means is configured to implement control to: drive the second supply pump by the electric motor to raise the pressure of a portion of the fluid discharged from the first supply pump to the prescribed pressure or above by using the second supply pump, and supply the fluid to the second supply target section, when the pressure of the fluid discharged from the first supply pump and supplied to the first supply target section is less than the prescribed pressure; and stop the driving of the second supply pump by the electric motor, when the pressure of the fluid supplied to the first supply target section is equal to or greater than the prescribed pressure, characterized by the motor drive control means for controlling driving of the electric motor on the basis of the pressure of the fluid discharged from the first supply pump and supplied to the first supply target section. drive the second supply pump by the electric motor to raise the pressure of a portion of the fluid discharged from the first supply pump to the prescribed pressure or above by using the second supply pump, and supply the fluid to the second supply target section, when the pressure of the fluid discharged from the first supply pump and supplied to the first supply target section is less than the prescribed pressure; and stop the driving of the second supply pump by the electric motor, when the pressure of the fluid supplied to the first supply target section is equal to or greater than the prescribed pressure, characterized by the motor drive control means for controlling driving of the electric motor on the basis of the pressure of the fluid discharged from the first supply pump and supplied to the first supply target section.