PURPOSE: To enable the easy and stable pressure filling of air in a pressure accumulating type sprayer designed to prefill the air in a water tank under pressure and spray an agent utilizing the air pressure at need.

CONSTITUTION: This pressure accumulating type sprayer is obtained by installing rocking arms 25 on both right and left sides of a tank 2 so as to enable the free vertical rocking with fulcra 19 located a little toward the rear of the tank 2 as the center and fixing a pair of cylinders 20 having rod ends (20a) directed to the front side in the rocking arms 25 and designed to perform operations to push in or take out the rod ends (20a) of the respective cylinders 20 by links 21 when the rocking arms 25 are vertically rocked. The front ends of the rocking arms 25 are mutually connected with a pedal 7 and air is filled from both the cylinders 20 through hoses 23 in the tank 2 under pressure by stepping in the pedal 7.