| 摘要 |
PROBLEM TO BE SOLVED: To provide an insertion type measuring instrument (gyro scope) inserted into a curved drilled hole of a small inner diameter (small in its diameter) and a small curvature radius, and a drilling method using the measuring instrument. SOLUTION: This measuring instrument includes a measuring instrument main body 3, a main body casing 3C for surrounding the measuring main body 3, a measuring instrument auxiliary equipment (electric cable connecting unit, signal converter, input and output interface and the like) 5, an auxiliary equipment casing for surrounding the measuring instrument auxiliary equipment 5, and a joining part (for example, universal joint 7). The joining part 7 connects the measuring instrument main body 3 and the main body casing 3C to the measuring instrument auxiliary equipment 5 and the auxiliary equipment casing 5C, and constituted to be foldedly bent to change a relative positional relation of the measuring instrument main body 3 and the main body casing 3C with respect to the measuring instrument auxiliary equipment 5 and the auxiliary equipment easing 5C (to deform a measuring instrument main body 3 side and the auxiliary equipment 5 side foldedly halfway).
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