To provide an injection device, which can confirm that an injection material is securely filled in a bore hole and can prevent breakage (co-separation), exfoliation or the like due to excessive application of pressure.SOLUTION: An injection device 1 injects an injection material 30 from a tip of an injection nozzle 11 inserted in a bore hole 113 into the bore hole 113. The injection device 1 comprises: a rubber plug 12 through which the injection nozzle 11 penetrates and where it can slide, and that is pressed toward the bore hole 113 in which the injection nozzle 11 is inserted to be brought into a sealed state; and an air cylinder 13 that presses the rubber plug 12 toward the tip side of the injection nozzle 11 by a predetermined pressure.SELECTED DRAWING: Figure 6
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