A syringe with which an accurate amount of a liquid can be discharged by a simple operation.The syringe 1 includes an outer tube 2, a gasket 3 slidable in the outer tube 2, a pusher 4 operable for moving the gasket 3, and a stopper 5 disposed to be slidable along the longitudinal direction of the pusher 4. The stopper 5 is fixed relative to the pusher 4 by the engagement of engaging portions, provided therein, with racks 47a, 47b formed on the pusher 4. When an operating portion 71 is depressed, the fixation condition is released, permitting regulation of the position of the stopper 5 on the pusher 4. When the depression on the operating portion 71 is canceled, the fixation condition is retained. When the pusher 4 is pressed in the tip end direction, a tip end face 66 of the stopper 5 comes into contact with a base end portion 28 of the outer tube 2, whereby the depth of insertion of the pusher 4 into the outer tube 2 is restricted, and a set amount of a chemical 100 is discharged through a diameter-reduced portion 22.
