To eject a liquid with high speed and high precision.

A device for ejecting fixed quantity of the liquid is constituted of a pump section which is composed of a plunger chamber bored in a cylinder block and of a plunger reciprocating in the plunger chamber and which measures an ejecting liquid by a desired quantity, a valve section for changing over a sucking liquid flow passage and a discharging liquid flow passage, a storing section for storing the liquid which can be communicated with the pump section according to a position of the valve section and an ejecting section provided with an ejecting port for ejecting the liquid. Further the device is characterized by that the pump section and the valve section are successively disposed and a most advanced position of the plunger is made to be a surface where a front end face of the plunger is joined to the valve section and the pump section. The valve section is disposed attachably and detachably to the pump section. The plunger chamber is constituted of a cylindrical member fitted into a hole bored in the cylinder block. The valve section is constituted of a changeover valve provided with a valve block having a first flow passage communicated with a storage vessel and a second flow passage communicated with the ejecting section.