A backpack type power sprayer (10) has a liquid tank (11) a liquid discharge pump (15) and a pump drive engine (16) assembled as a unit. The pump and the engine are positioned below the liquid tank. The liquid tank has a filling opening (95) on the upper surface (11g) thereof. The filling opening is positioned rearward of the center (Ct) in the back and front direction of the liquid tank. The width of the liquid tank is set to become wider extending upward from the bottom end (11d) of the liquid tank. The rearward lower part (11i) of the liquid tank has a depression. The upper front part (11k) of the tank is an inclined surface that is inclined rearward and upward from the front surface (11a).
