A fluid supply apparatus which supplies fluid to a medical apparatus includes: a pump mechanism including a first pump capable of a suction operation of the fluid after a feeding operation of the fluid, and a second pump capable of a suction operation of the fluid during the feeding operation and a feeding operation of the fluid during the suction operation a flow path which includes an elastic member and which communicates with the first pump and the second pump and supplies the fluid to the medical apparatus and a flow path deforming unit which deforms a part of the flow path. The flow path deforming unit starts first deformation of the flow path before the first pump switches from the feeding operation to the suction operation, and completes the first deformation and starts second deformation of the flow path during the feeding operation by the second pump.
