PROBLEM TO BE SOLVED: To enable a lifting of a knapsack frame with hands easily and at the same time, to enable a turning-over easily.SOLUTION: A knapsack power sprayer 100 has the knapsack frame 5 in which a back fixing part 6 fixed to the back of a worker, a seat part 7 extending from the lower part of the back fixing part 6 backward, a chemical tank 1 positioned at the upper side from the seat part 7 and pooling a chemical agent are formed integrally. A concave part 9 for a handle is provided on the bottom surface of the seat part 7, and by having the concave part 9 for the handle with hands, the knapsack frame 5 can be lifted with hands easily and can be turned over easily.
