A fluid supply apparatus for an endoscope (1) that is connected to an endoscope main body (60) that has a forceps channel (3) that has a forceps aperture (2) in a base end and into which a treatment tool is inserted, and a suction channel (8) that branches from a branching portion (5) provided partway along the forceps channel and is connected to a suction source (7) includes: a supply tube portion (17) into which are inserted a treatment tool and fluid that is supplied from a fluid supply source a movement mechanism (18) that, when the supply tube portion (17) is pressed in an axial direction, causes the supply tube portion (17) to move forwards inside the forceps channel (3) in a direction in which the supply tube portion (17) penetrates with respect to the forceps aperture (2), and, when the pressing state is terminated, causes the supply tube portion (17) to move backwards inside the forceps channel (3) in a direction in which the supply tube portion (17) is removed from the forceps aperture (2) and a valve portion (20) that, as a result of the supply tube portion (17) moving forwards inside the forceps channel (3), regulates the fluid that has flowed from the supply tube portion (17) into the forceps channel (3) from flowing into the suction channel (8).
