Abstract: A coordinate measuring instrument, wherein a measuring element support member (1) having a measuring element (2) is movably supported on a mount plate (3), this measuring element (2) is abutted against the surface and the like of a work to be measured, which is mounted on the mount plate (3), and relative movement values between this measuring element (2) and the work are detected to measure a configuration and the like of the work. In this measuring instrument, vertical surfaces (3A, 3B, 50A and 50B) are formed on the mount plate (3) and air bearings (47, 52 and 53) opposed to these vertical surfaces are provided on legs (8 and 9) of the measuring element support member (1), so that the measuring element support member (1) can be regulated in its position in a direction of X-axis.

Abstract: A coordinate measuring instrument, wherein a measuring element support member (1) having a measuring element (2) is movably supported on a mount plate (3), this measuring element (2) is abutted against the surface and the like of a work to be measured, which is mounted on the mount plate (3), and relative movement values between this measuring element (2) and the work are detected to measure a configuration and the like of the work. In this measuring instrument, vertical surfaces (3A, 3B, 50A and 50B) are formed on the mount plate (30) and air bearings (47, 52 and 53) opposed to these vertical surfaces are provided on legs (8 and 9) of the measuring element support member (1), so that the measuring element support member (1) can be regulated in its position in a direction of X-axis.