Connector with protective device

A connector with a protective device includes a card insertion holder, terminals, and a protective sheet. The card insertion holder includes a base, two long side walls, two short side walls, and an insertion slot. The two short side walls are between the two long side walls. The two long side walls and the two short side walls are connected to the base and jointly form the insertion slot with the base. Each long side wall and each short side wall respectively includes a top surface and an inner side surface. The top surfaces of the long side walls and the short side walls are away from the base. The inner side surfaces of the long side walls and the short side walls surround the insertion slot. The terminals extend from the base to the long side walls and are arranged on the inner side surfaces of the long side walls. The protective sheet includes a top plate and two first inner side plates. The top plate covers the top surfaces of the short side walls. Each of the first inner side plates extends from the to