A measuring apparatus for speedily measuring a bearing height is disclosed. A plunger of a movable cylinder is extended with a test load P by a constant pressure applying mechanism S. The movable cylinder is ascended from a receded position to a measuring position by a slide cam. A bearing half W disposed on a pushing member is fitted in a receiving cavity of a standard tool in such a manner that an end of the bearing half W slightly protrudes from the receiving cavity portion. When the movable cylinder slightly exceeds the measuring position, a plunger is pressed for the length of the end protruded from the receiving cavity portion. At this point, the bearing half W is held with the test load P. Thus, the bearing height can be immediately measured by a length sensor.