To provide a resin composition which is used as a material for an insulating wire used in a transmission wire harness and tubing, meets oil resistance, abrasion resistance, heat resistance, flexibility and the like, is low-cost, has a low specific density and good extrusion processability without causing any problem of production, and an insulating wire, a wire and cable, tubing, and heat-shrinkable tubing which are obtained by using this resin composition.

The resin composition comprises (A) a fluoropolymer having vinylidene fluoride as the main repeating unit, (B) an acrylic rubber, (C) silica, and (D) carbon black at a weight ratio of (A) to (B) of 40/60 to 90/10, and, based on 100 pts. weight sum of (A) and (B), the amount of (C) compounded is 10 to 40 pts. wt. and the amount of (D) compounded is 5-20 pts. wt. The insulating wire, wire and cable, tubing, and heat-shrinkable tubing are obtained by using this resin composition.