An electronic device is provided. The electronic device includes a housing including a first housing and a second housing connected to the first housing to slide within a designated range, a flexible display including a display panel and a reinforcing sheet, the flexible display including a first portion and a second portion extended from the first portion, and drawn in or out of the housing as the second housing moves with respect to the first housing, a circuit board, and a fingerprint sensor spaced from a rear surface of the flexible display, and disposed on the circuit board. The reinforcing sheet may include a first opening area disposed between the fingerprint sensor and the display panel with the second portion drawn in and a second opening area disposed between the fingerprint sensor and the display panel with the second portion drawn out.