The section between Morioka and Hachinohe (96.6 km) on the Tohoku Shinkansen line passes mountainous inland areas, where there are twenty-one tunnels that are 69 km long in total. The geology surrounding this section consists of various rock facies. When these tunnels were constructed, I measured the axial forces affecting rock bolts and evaluated their effectiveness under different geologic conditions. From the measurements and evaluation, it has been proved that rock bolts are effective irrespective of the geologic condition.