Abstract: An automatic shut off dispensing nozzle has a nozzle main body, a discharge pipe disposed down stream of the main body, a fluid passage provided substantially straight in the main body, a valve mechanism having an axial line crossing the fluid passage, a lever provided to the main body for the operation of the valve mechanism, a first sliding shaft interlocking with the lever and having the same axial line as that of the valve mechanism, a second sliding shaft provided on the same axial line of the first sliding shaft for the operation of the valve mechanism, rollers provided for causing engagement between each of the sliding shafts, a diaphragm for the retention of the rollers, a negative pressure chamber including the diaphragm, an apparatus for generating a negative pressure which is communicated to the negative pressure chamber, and an atmosphere introducing port provided in the discharge pipe which communicates with the negative pressure chamber.