An arm type three-dimensional measuring machine includes: a multi-jointed arm mechanism comprising a probe in a distal end; a processing part for computing a position of said probe; and an inclinometer configured to detect an inclination amount of a base part from a vertical direction in the base part for supporting the multi-jointed arm mechanism, wherein the processing part computes a position of the probe using the base part as a criterion and corrects the position of the probe using the base part as the criterion in a time-series manner based on an output from the inclinometer.