PROBLEM TO BE SOLVED: To provide an excavation device for undermining in which the excavated soil produced in the undermining can be crushed to an extent capable of being discharged by a land pump while undermining the lower part of the underground obstacle.SOLUTION: An excavation device includes an excavation mechanism 3 for undermining, a crushing aid 4 for crushing the excavation soil in cooperation with the excavation mechanism 3 for undermining, and a support frame 2 in support of these. The excavation mechanism 3 for undermining comprises a rotary cutter disposed so that the rotating shaft extends in the groove width direction of an excavated groove 10. The support frame 2 comprises a body frame 5 and a turning arm 6 turned in the vertical direction. The excavation mechanism 3 for undermining and the crushing aid 4 are installed in the side becoming the upper surface when the turning arm 6 is overhung from the support frame 2.SELECTED DRAWING: Figure 5
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