To reduce a change in alignment due to an operation condition in the shafting where a driving shaft and a driven shaft are connected to each other through a connecting means such as a coupling.

This alignment adjusting apparatus for shafting, in which a driving shaft 1 and a driven shaft 2 are connected to each other through a coupling 3 and journaled through bearings 5, 8 supported on bearing supporting parts 7, 10 respectively, includes temperature adjusting means 13, 14, 15 at the bearing supporting parts 7, 10 supporting the bearings 5, 8. The vertical height adjustment of one bearing supporting part is made by a temperature change by a temperature adjusting means, and a deviation of that on the driving shaft side from that on the driven shaft side is controlled so as to be eliminated.