To provide a water cut-off structure between electric wire strands and a water cut-off method between electric wire strands, capable of causing the workability to be improved by shortening the hardening time and being produced without waste at high efficiency, which provides the good recycle property.

In the water cut-off structure between electric wire strands and the water cut-off method between electric wire strands, the water cut-off structure between electric wire strands cuts off between strands 12 of electric wires 10 with strands 12 housed in a covering section 11. The strands 12 with the covering section 11 removed are immersed in a resin material mixed with heating sources and can be deposited due to irradiation of infrared light, and then the infrared light is irradiated to the resin material at a predetermined position.