PUMP

PROBLEM TO BE SOLVED: To prevent a nozzle from accidentally rotating, causing a locked state to be canceled, by providing a female screw which can be engaged with a male screw of an upper cap on an inner peripheral face of an ejector head and by providing a second ratchet gear to be engaged oppositely with a first ratchet gear on a lower part of the female screw. SOLUTION: A male screw 6 is provided on an external side face of an upper cap of a liquid discharging pump 1, a first ratchet gear 14 is provided on a lower part of the male screw 6, a female screw 10 which can be engaged with the male screw 6 of the upper cap is provided on an inner peripheral face of an ejector head, and a second ratchet gear 15 to be oppositely engaged with the first ratchet gear 14 is provided on a lower part of the female screw. Thus when the pump 1 is mounted on a container, the ejector head may not rotate together even if excessive rotary torque is applied to a container cap 11, so that the screws may be prevented from loosening due to relative rotation of the ejector head and also hot water can be prevented from flowing into a pump body 12 along a stem 16.