A step and gap measuring instrument, comprising: a case body; a spindle disposed on the case body movably in its axial direction; a contact point being disposed at one end of the spindle for abutting a workpiece; a retainer for retaining the case body in a predetermined posture; a displacement detector for detecting the displacement of the spindle; and a display for displaying the displacement detected by the displacement detector, a gap measuring portion is formed into a shape that contains one contour line (311A, L1) and another contour line (311B, L2) for abutting the workpiece at the time of gap measurement; the one contour line is formed in the direction parallel with the axial direction of the spindle; and the other contour line (311 B, L2) is a straight line that forms an acute angle with the one contour line (311 A, L1); characterized in that the contact point is provided with a step measuring portion and the gap measuring portion for abutting the workpiece; the one contour line is an axis of a cone; the other contour line (311B, L2) is a generatrix of the cone; and the step measuring portion is formed on the intersection of the extension of the one contour line (311A, L1) and the extension of the other contour line (311 B, L2); the step and gap measuring instrument further comprises: a computation controller for computing the gap of the workpiece on the basis of the displacement of the spindle detected by the displacement detector and the shape of the contact point at the time of gap measurement; and a display switching section for making the display show the displacement of the spindle detected by the displacement detector at the time of step measurement and the gap computed by the computation controller at the time of gap measurement. a case body; a spindle disposed on the case body movably in its axial direction; a contact point being disposed at one end of the spindle for abutting a workpiece; a retainer for retaining the case body in a predetermined posture; a displacement detector for detecting the displacement of the spindle; and a display for displaying the displacement detected by the displacement detector, a gap measuring portion is formed into a shape that contains one contour line (311A, L1) and another contour line (311B, L2) for abutting the workpiece at the time of gap measurement; the one contour line is formed in the direction parallel with the axial direction of the spindle; and the other contour line (311 B, L2) is a straight line that forms an acute angle with the one contour line (311 A, L1); characterized in that the contact point is provided with a step measuring portion and the gap measuring portion for abutting the workpiece; the one contour line is an axis of a cone; the other contour line (311B, L2) is a generatrix of the cone; and the step measuring portion is formed on the intersection of the extension of the one contour line (311A, L1) and the extension of the other contour line (311 B, L2); the step and gap measuring instrument further comprises: a computation controller for computing the gap of the workpiece on the basis of the displacement of the spindle detected by the displacement detector and the shape of the contact point at the time of gap measurement; and a display switching section for making the display show the displacement of the spindle detected by the displacement detector at the time of step measurement and the gap computed by the computation controller at the time of gap measurement. a computation controller for computing the gap of the workpiece on the basis of the displacement of the spindle detected by the displacement detector and the shape of the contact point at the time of gap measurement; and a display switching section for making the display show the displacement of the spindle detected by the displacement detector at the time of step measurement and the gap computed by the computation controller at the time of gap measurement.