A connector includes a housing that includes an insertion recess portion into which the connection member is insertable from an end of the connection member in an insertion direction, a contact, and an insertion-resistance-giving member to give insertion resistance to the connection member through a projection. The projection protrudes from a side opposite to a contact portion of the contact into the insertion recess portion at a position away from the contact portion in a direction opposite to the insertion direction. When the connection member is inserted into the insertion recess portion, the connection member moves through a predetermined distance in the insertion direction until the end of the connection member comes into contact with a halfway portion of an inclined portion of the contact after the projection completes a run-aground operation in which the projection runs aground on an outer surface of a reinforcement plate in the end of the connection member. Insertion resistance received by the connection member generates a maximum value during the run-aground operation during a period of time during which the end of the connection member moves to the insertion completion position from an insertion starting position.