A connector includes a housing in which a recess having an opening on a rear face is provided, and a slider to be slid in the recess. A flexible substrate is inserted in the recess with the slider so that a contact on the flexible substrate is connected to a contact on the housing. On both sides of the slider, a pair of lock arms are provided for fixing the slider to the housing when the slider is fitted in the housing. Parts of the respective lock arms in the recess are exposed out of the housing at portions near both sides of the upper face of the housing when the slider is fitted in the housing, and either of the lock arms in the recess are not exposed out of the housing when the slider is not fitted in the housing. Each portion of the housing where each lock arm is exposed is provided near a corner portion where the upper face, a side face, and a front face of the housing are perpendicularly connected to each other.