Measuring apparatus and support mechanism of columnar work piece

A measuring apparatus measuring an elongated, columnar work piece having a centering aperture at two ends, the measuring apparatus comprising:

• a first end support configured to support a first end of the columnar work piece;
• a second end support configured to support a second end of the columnar work piece;
• and
• a measurer having a probe configured to measure the columnar work piece supported by the first end support and the second end support, wherein:
• the first end support includes a first end support body configured to attachably and detachably fit into the centering aperture of the first end of the columnar work piece,
• the first end support body includes at least two cut-outs,
• in a state where the first end support body is fitted into the centering aperture, an interior surface of the centering aperture is visible to the exterior through the cut-outs, and
• the measurer is configured to insert the probe into the centering aperture through the cut-outs and measure the interior surface of the centering aperture.