A windshield device for a saddle-type vehicle comprising: a concavely curved air duct which is raised in a rearward direction so as to guide a traveling airflow from a front side of the vehicle to an upward direction; an inner curved wall portion which forms a wall portion of the air duct on an inside of the vehicle; a curved wall portion which forms a wall portion of the air duct on an outside of the vehicle and is curved along the air duct; a cowling portion which is formed in a convexly curved shape toward the outer side of the vehicle so as to cover the curved wall portion from the outside of the vehicle, with a gap being interposed between the curved wall portion and the cowling portion; and left-right side wall portions each provided at left-right sides of the curved wall portion and extends towards the cowling portion; wherein an air channel is formed by the curved wall portion, the cowling portion and left-right side wall portions, the air channel guiding the traveling airflow from the front direction of the vehicle toward an upward direction, so that the traveling airflow moves further upper than the upper end of the cowling portion whereby an upper portion of the inner curved wall portion has an inner flat transparent member formed in a rectangular shape which extends in a left-right direction when seen at a front view, and an upper portion of the curved wall portion has an outer flat transparent member formed in a rectangular shape which extends in a widthwise direction when seen at a front view, and the cowling portion has, at an upper portion thereof, an upper cut portion which is formed in a semi-circular shape, when seen from the front side, and forms an arc-shaped upper edge shape which is convex in a downward direction, and the cowling portion has, at a lower portion at an inner side in the left-right direction thereof, a lower cut portion which is formed in a rectangular shape, when seen from the front side, and forms a U-shaped inner edge shape which is opened in a downward direction. a concavely curved air duct which is raised in a rearward direction so as to guide a traveling airflow from a front side of the vehicle to an upward direction; an inner curved wall portion which forms a wall portion of the air duct on an inside of the vehicle; a curved wall portion which forms a wall portion of the air duct on an outside of the vehicle and is curved along the air duct; a cowling portion which is formed in a convexly curved shape toward the outer side of the vehicle so as to cover the curved wall portion from the outside of the vehicle, with a gap being interposed between the curved wall portion and the cowling portion; and left-right side wall portions each provided at left-right sides of the curved wall portion and extends towards the cowling portion; wherein an air channel is formed by the curved wall portion, the cowling portion and left-right side wall portions, the air channel guiding the traveling airflow from the front direction of the vehicle toward an upward direction, so that the traveling airflow moves further upper than the upper end of the cowling portion whereby an upper portion of the inner curved wall portion has an inner flat transparent member formed in a rectangular shape which extends in a left-right direction when seen at a front view, and an upper portion of the curved wall portion has an outer flat transparent member formed in a rectangular shape which extends in a widthwise direction when seen at a front view, and the cowling portion has, at an upper portion thereof, an upper cut portion which is formed in a semi-circular shape, when seen from the front side, and forms an arc-shaped upper edge shape which is convex in a downward direction, and the cowling portion has, at a lower portion at an inner side in the left-right direction thereof, a lower cut portion which is formed in a rectangular shape, when seen from the front side, and forms a U-shaped inner edge shape which is opened in a downward direction.