PURPOSE: To provide a measuring device which can precisely measure shape of an excavating hole in all directions.

CONSTITUTION: The measuring device is provided with three piezoelectric vibrating gyros 3x, 3y and 3z to respectively measure a turning angle around (x) axis, (y) axis and (z) axis crossing at a right angle to each other, and is provided with an angle gauge 5 insertable into a measuring object hole a moving means 7 to move the angle gauge 5 in the depth direction in the measuring object hole 1, a depth indicator 9 to measure moving distance of the angle gauge 5 in the measuring object hole 1 and an operation device 10 having a memory 11 connected to the angle gauge 5 and the depth indicator 9. The (z) axis of the angle gauge 5 is made to coincide with the depth direction at the inlet of the measuring object hole 1. The angle gauge 5 is inserted into the measuring object hole 1, and turning angle around the three axes of the angle gauge 5 is measured in the last time position in the measuring object hole 1, and when the angle gauge 5 is moved to a this time position from the last time position, moving distance is measured by a range finder 9, and depth directional displacement (zi) of this time position to the last time position and displacements (xi and yi) in the direction perpendicular to the depth direction are calculated from the turning angle and the moving distance, and are stored in a memory, and this cycle is repeated.