Waterproof connector

A waterproof connector comprising:na plate-like cable that is provided with a plurality of conductor parts;a connector housing that is provided with a rectangular insertion opening into which the plate-like cable is inserted;a sealing member through which the plate-like cable is inserted and that seals between the insertion opening and the plate-like cable; anda holder that covers an outer periphery of an opening end part of the connector housing where the insertion opening is formed, that is provided with a lock part which engages with the opening end part, and that holds the plate-like cable relative to the insertion opening,wherein a plurality of bosses, which are inserted into a plurality of connector side through holes formed in upper and lower surfaces of the opening end part respectively, are protruded on the holder;wherein a plurality of cable side through holes into which the plurality of bosses are inserted are formed in the plate-like cable at a back end side in an insertion direction in which the sealing member is inserted into the connector housing; andwherein a back end surface of the sealing member abuts against the plurality of bosses which are inserted into the plurality of cable side through holes.