To obtain a gear arrangement with smaller axial force without trying by inputting diversified gear arrangement data by providing an axial force reduction calculation part for obtaining a gear arrangement where an axial force becomes smaller than a gear arrangement being inputted by a user, in a gear row power transmission characteristic-analyzing device.

By inputting gear position, size, pressure angle, load, axial diameter, and friction coefficient and by allowing a drive force/axial force/motor torque calculation part 41 to perform calculation, the results are stored at an axial force storage part 25, a drive force storage part 27, and a motor torque storage part 24. When an axial force reduction calculation method by changing the size is selected, an axial force reduction calculation part 43 by changing the size changes the size of the gear so that the axial force can be reduced while maintaining the contact with an adjacent gear without changing the position of the adjacent gear successively for each gear other than a fixed gear. Also, when the axial force reduction calculation method by changing the position is selected, a position change axial force reduction calculation part 44 obtains the direction of increase/decrease to see whether the relative position and the angle between gears should be increased as compared with the current status or not, thus determining the order of priority.