To provide a top-hinged sliding door which makes the mounting part and engaging part of an intertruss bracing component inconspicuous, the opening width of which can be made great, and which enables each sash to be stably moved.

In this top-hinged sliding door 1, the length of a bottom rail 23 of one sash 3 is almost equal in dimension to the width W of the sash; an opening 37, which is opened on the side surface of the other sash, and a guide groove 39, which has an upward or downward opening communicating with the opening 37, are provided in the bottom rail 23 over the longitudinal direction of the bottom rail 23; a mounting part 41 of the intertruss bracing component 7 is mounted on a depth surface 29a of a meeting stile 29; an arm part 43 is formed in an approximate L-shape in a plan view from the mounting part 41; an engaging part 45 is engaged with the guide groove 39 of one sash 3; one sash guide 9 and the other sash guide 11 are each provided in the state of protruding from a floor surface G; and in a closed state of the sashes, the respective sash guides 9 and 11 are positioned below the meeting stiles 19 and 29 of the sashes and between the indoor and outdoor side walls of the bottom rails 23 and 33.