A connector connectable to a plurality of receptacles of different specifications is provided while a connector of the prior-art configuration is not adapted for the connection with such receptacles. The connector includes: a connector body; and a connector portion partially inserted in the connector body and partially projected from the connector body. The connector portion includes: a first connector block that is singularly capable of mating with a receptacle conforming to a first specification but is singularly incapable of mating with a receptacle conforming to a second specification; and a second connector block that is disposed on the first connector block and combined with the first connector block to be capable of mating with the receptacle conforming to the second specification. The second connector block is free to slide on the first connector block 21 and to be inserted in the connector body.