A multi-connected connector 1 includes a plurality of first connectors 110a, 110b, 110c and 110d and a second connector 20 having a plurality of connector fitting chambers 21a, 21b, 21c, 21d arranged in a row in a transverse direction to fit the first connectors. The first connectors include a connector whose length is different from the other connector of the first connectors in a fitting direction of the first connectors. Butting walls 22a, 22b, 22c, 22d as positioning parts that determine fitting completed positions of the first connectors respectively in the connector fitting chambers 21a, 21b, 21c, 21d are arranged in accordance with lengths in the fitting direction of the first connectors to be connected so that rear end surfaces of the plurality of first connectors which are normally completely fitted are aligned so as to be flush.