The present invention provides an ejector (1) provided with an ejector main body (2) and a press-down head (4), the ejector main body (2) comprising a stem (20), wherein the press-down head (4) is provided with a coupling tube portion (35) and a coupling axis portion (36). The coupling tube portion (35) is provided so as to protrude laterally. The coupling axis portion (36) is provided so as to protrude laterally and defines a flow path (R) between the coupling tube portion and the coupling axis portion, the flow path (R) communicating with the inside of the stem. The coupling tube portion (35) is provided with an L-shaped ejection tube (3). The ejection tube (3) includes an ejection hole (40) and is mounted so as to be capable of rotating around an axis (O2). A substance in the coupling tube portion is linearly ejected through the ejection hole (40). An outside mounting tube (41) and an inside mounting tube (42) are provided at the base end of the ejection tube. The outside mounting tube (41) is mounted in the coupling tube portion. The inside mounting tube (42) is mounted in the coupling axis portion and sandwiches the coupling tube portion together with the outside mounting tube. The ejection tube is mounted in the coupling tube portion interposed by the outside mounting tube and the inside mounting tube. A sealing mechanism (47) is provided between the inside mounting tube and the outside mounting tube, the sealing mechanism (47) switching the communication and blocking between the ejection hole and the flow path in accordance with the rotation of the ejection tube.