There is provided a waterproof connector in which swing of electric wires inside a rear holder can be prevented, and insertion of the rear holder into a connector body can be easily performed with a small force. The waterproof connector includes a connector body 2 having a terminal containing room 21 in which a terminal metal fitting 9 of an electric wire 7 is contained, a waterproof plug 3 which is fitted to the electric wire 7 at a wire withdrawing side 23 of the connector body 2 and assembled to the wire withdrawing side 23 of the connector body 2, and a rear holder 5 which is mounted on the wire withdrawing side 23 of the connector body 2 thereby to prevent drop of the waterproof plug 3 from the connector body 2. The rear holder includes a pair of half bodies which are separated as a first holder body 51 and a second holder body 52, wire containing recesses 53, 54 which contain respective semi-circular portions of the electric wire are respectively formed in the first holder body 51 and the second holder body 52, and the first holder body 51 and the second holder body 52 are individually mounted on the wire withdrawing side 23 of the connector body 2 to be combined together.