A rollable flexible display comprises: a display panel on which signal lines and pixels are arranged; a control board that supplies the signal lines with signals to drive the pixels; and a panel roller portion around which the display panel is rolled up and including an inner space for placing the control board, wherein the transverse width of the control board is greater than the inner diameter of the panel roller portion, and an insert portion for insertion into a slot in the panel roller portion is provided on at least one edge of the control board.