An insulated wire that includes an insulating layer containing crosslinked silicone rubber and that has good heat resistance is provided. The insulated wire is obtained by covering a conductor with an insulating layer containing crosslinked silicone rubber and silica. The insulating layer contains the silica in an amount of not more than 40 mol % in terms of Si with respect to the total amount of the crosslinked silicone rubber and the silica. The crosslinked silicone rubber contains, in an amount of at least 0.5 mol %, a siloxane unit having a phenyl group as an organo group.