PURPOSE: To simplify the security in the assembly by integration of the suction passage with the chasis for retaining the motor, the deceleration mechanism and the like in such a manner that one passage is allowed to communicate hydraulically sealed to a suction port of the pump body while the other to a suction pipe thereof.

CONSTITUTION: The rotation of a motor 13 is transmitted while reduced with a gear 15 whereby a lever pivotted with a shaft 18 on the chasis 12 is reciprocated with a crank pin. In this manner, a piston 22 of the pump body 6 is reciprocated through a rotary pin 20 provided on the other end of the lever 17 so as to suck liquid from a vessel and pressurize thereof. Then, the liquid is atomized out through a nozzle of an atomizer. Here, a roughly L-shaped suction passage 29 integrated with the chasis 12 is communicated hydraulically sealed to a suction port 7 of the pump body 6 at one end while to a suction pipe inserted into the base at the other end. With such an arrangement, the integration of the body 6 with a motor or the like enables individual test of pump performance and simplification in the assembly process.