Why Japan did not plan to invade Australia

How seriously did Japan consider invading Australia during the Second World War?

The Allies worried about it, but Japan was not seriously planning it because the logistics and operational risks were formidable.

Allied fear differed from Japanese intent. Allied planners took the possibility of an Australian invasion seriously, but Japan was not preparing to carry it out as a practical operation. The logistical reach would be immense. Japanese experience fighting the Soviet Army in Mongolia and northern China also demonstrated the danger of a manoeuvre campaign across open space, a problem Australia would reproduce on a continental scale.