Waterproof structure of wire harness with connector

A waterproof structure of a wire harness with a connector in which crimp terminals are housed and held in a plurality of cavities respectively in the connector, the crimp terminals being crimped to electric wire terminals of a plurality of electric wires included in the wire harness, includes a sheet material having a width covering both the connector and the electric wires from rear cavity openings, having waterproof property and elasticity, and having adhesive surfaces on one side. The sheet material is fixedly attached to a connector neck portion where the plurality of electric wires project outward from the rear cavity openings of the connector by tightly attaching the adhesive surfaces to each other from two sides having the connector therebetween, and thus the connector neck portion is covered by the sheet material.