A parallax barrier device includes: a first substrate; a first patterned transparent electrode layer disposed on the first substrate; a first patterned electrochromic material layer disposed on the first patterned transparent electrode layer and including a plurality of electrochromic structures, in which lengths, widths or diameters of the electrochromic structures are 50 nm to 500 nm, and included angles of the electrochromic structures and a surface of the first substrate to be deposited are 30° to 89°; a second substrate; a second patterned transparent electrode layer disposed on the second substrate; a second patterned electrochromic material layer disposed on the second patterned transparent electrode layer; and an electrolyte disposed between the first patterned electrochromic material layer and the second patterned electrochromic material layer.