To provide a measuring instrument of a pipe core and height of a laid pipe which apparatus is equipped with a laser collimator, enables a work for drawing out the core of a laid pipe from above the pipe or from inside the pipe, and measuring a distance from a leveling string, and a work for indicating accurately a shaving position by using the laser collimator, shaving a road surface, and laying a sewer pipe, by using a single apparatus, and can improve working efficiency remarkably.

This measuring instrument of a pipe core and height of a laid pipe has a laser collimator, a measuring instrument main body equipped with the laser collimator, and a pipe diameter guide fixed on the measuring instrument main body.