PROBLEM TO BE SOLVED: To provide a warning device for blower capable of notifying a user of the fact that a blower is used under pressure exceeding an upper limit of a use pressure range determined in the blower.SOLUTION: When a blower is used under pressure exceeding an upper limit of a user pressure range, a displacement plug 20 at a tip of a branch flow passage 14 is displaced with a spring 22 compressed, by discharge pressure from the branch flow passage 14 in a warning device 10 for blower, and then the branch flow passage 14 is opened. In the opened state, discharged air of the blower flowing from the branch flow passage 14 to a pipe opening 34 is emitted from a sound release port 36 to the outside of the warning device for blower through a ventilation space 38, to issue whistle sound as warning sound.SELECTED DRAWING: Figure 3
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