A connector includes an insulator having an accommodation space into which an object to be connected to the connector is removably insertable, the object being a thin plate having a pair of engaging recesses at opposite side edges thereof; at least one contact fixed to the insulator, the object being connected to the contact upon insertion into the accommodation space; and a pair of resilient engaging protrusions, each having an engaging portion, which are resiliently deformable away from each other in a plane in which the object lies, the engaging portions being respectively engaged in the pair of engaging recesses of the inserted object. A distance between the engaging portions of the pair of resilient engaging protrusions in a free state is smaller than a width of an insertion end of the object which is to be inserted into the accommodation space.