A connector includes an insulator including contact insertion grooves and partition walls positioned therebetween, the contact insertion grooves being elongated in an insertion/removal direction of a thin plate-shaped object inserted into the insulator and arranged in a direction orthogonal thereto; and contacts inserted into the contact insertion grooves, each contact including first and second contact portions, and a connecting portion which connects the first and second contact portions to each other, wherein at least one of the first and second contact portions comes in contact with the thin plate-shaped object when the thin plate-shaped object is inserted into the insulator. A hollow portion is formed in each partition wall of the insulator so as to overlap part of each contact as viewed in a contact arranging direction, and so as to be prevented from being communicatively connected with the contact insertion grooves by the partition walls.