To surely prevent the leakage of liquid caused by the inclination of a piston or the increase of internal pressure.

In this trigger type liquid ejector provided with a body 2 provided with a jetting nozzle 1, a cap 3 for mounting a base part of an intake 3a inside and for fixing and holding the body 2 to a mouth part of a vessel, an operation lever 4 supported by the body 2 to be capable of rocking with a pivot shaft and a pump comprising a cylinder 5 having an opening 6 for replacing air in a vessel through the intake 3a and a reciprocally moving piston 7, two seal lips 8a and 8b sliding along the wall surface of the cylinder 5 and linearly arranged to be positioned inside and outside are provided on the piston 7, a space zone K to position the opening 6 regardless of the reciprocal movement of the piston 7 is provided between the two seal lips 8a and 8b and a recessed part 9 for introducing the outside air into the cylinder 5 is formed on the cylinder 5 by forming a gap between the outside seal lip 8a and the inside wall surface of the cylinder 5 only at a pulling limit position of the operation lever 4.