To provide insulated wire for submersible motors whose insulation property and external flaw resisting property are excellent.

This is insulated wire for submersible motors whose insulation property and external flaw resisting property are excellent, and on the periphery of a copper conductor 1, a covering of an insulating layer 2 made of a vinyl mixture composed by mixing 20-40 pts.wt. plasticizer and 5 pts.wt. or less filling agent with 100 pts.wt. vinyl resin.