To efficiently dry a sheet without causing turnups or creases.

This drying device 1 is constituted of a lower side net conveyer 2, an upper side net conveyer 3 and a hot-air blowing nozzle 4 arranged above the upper side net conveyer 3 and/or below the lower side net conveyer 2 and blows hot air to the sheet S by the hot-air blowing nozzle 4 from upward and/or downward of the sheet S with pinching and carrying the sheet S by the lower side net conveyer 2 and the upper side net conveyer 3. Since the sheet S is pinched by the net conveyers 2, 3, turnups or creases are eliminated.