The present invention is configured so that a pump provided outside a tank is supported by a simple structure. The present invention comprises: a tank (10) for containing spray liquid a piston pump (40) for applying pressure to the inside of the tank (10) and a spray gun (60) for discharging and spraying the spray liquid within the tank (10) by the pressure of the piston pump (40). The tank (10) comprises in the outer peripheral section thereof a recess (27) extending in the height direction, and the piston pump (40) is fitted in the recess (27) from the outside of the tank (10). Also, the lower part (11D) of the tank (10) and the lower part (40E) of the cylinder of the piston pump (40) are connected by a tank base (15), and the top part (11A) of the tank (10) and the upper part (40D) of the cylinder of the piston pump (40) are connected by an upper cap (14).
