PROBLEM TO BE SOLVED: To provide a bedrock property investigation device of a tunnel working face, which can directly observe a bedrock property of the front of a working face of a tunnel in a visual manner through an endoscope camera.SOLUTION: A bedrock property investigation device of a tunnel working face, includes: an investigating casing 1 inserted into a drilled hole A formed in a working face of a tunnel; and an endoscope camera 2 inserted into the investigating casing 1. The investigating casing 1 includes: a tip cone 3 arranged at a tip part thereof; an observing window 4 arranged at a side part thereof; and a side view mirror 6 arranged inside so as to mirror a hole wall through the observing window 4. The endoscope camera 2 images the hole wall mirrored by the side view mirror 6, so that the hole wall is directly observed. The investigating casing 1 is configurated by detachably connecting a plurality of unit pipes together in an axial direction of the pipes. The endoscope camera 2 is connected to a monitor 8.SELECTED DRAWING: Figure 1
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