To provide a production device, a production method and a production program for machining data of a working machine, preventing occurrence of variation of a gear shape.

Coordinates of a plurality of coordinate points P1(X1, X2), P2(X2, Y2), P3(X3, Y3), etc. positioned on an outer shape track L of a gear are calculated in an xy coordinates passing the origin O1 (1=0, 1=0), and an arc s1 (a radius r1) of a central angle 10 with the origin O1 as the center, passing the first coordinate point P1 and the second coordinate point P2 is calculated. A line segment g connecting the second coordinate point P2 and the third coordinate point P3 is calculated, an intersection point O2 between a perpendicular bisector m and a radial line h1 of the arc s1 is calculated, an arc s2 with the intersection point O2 as the center with a distance from the intersection point to the second coordinate point P2 as a radius r2 is calculated, and end parts of the arcs s1, s2 cross their radial lines h1, h2 at right angles wherein the arc s2 is approximate data of the gear outer shape track from the second coordinate point P2 to the third coordinate point P3.