An electronic device is provided. The electronic device includes a first housing, a second housing coupled to the first housing so as to slide in a first direction and a second direction opposite to the first direction, a flexible display including an exposed region that is exposed on a front surface of the electronic device and varied in size in response to sliding of the second housing, a sensing substrate disposed in the first housing, and a conductive roller disposed in the second housing so as to be rotatable. A plurality of sensing pads are disposed on one surface of the sensing substrate. The conductive roller is configured to make contact with a part of the plurality of sensing pads as the second housing slides relative to the first housing. The plurality of sensing pads include a plurality of position pads that make contact with the conductive roller in a state in which the exposed region of the flexible display is formed in one or more specified sizes.