INK DRYING APPARATUS

To obtain a compact ink drying apparatus capable of drying ink ejected to a resin substrate.The ink drying apparatus comprising a hot air dryer 2, a hot air supplying part, and an exhausting part, wherein the hot air dryer 2 is provided with a drying furnace 20, a substrate conveying path 21 formed as a spirally shaped path provided in the drying furnace 20, and a plurality of substrate drying ducts 22 blowing hot air to a surface of a resin substrate 15 on which ink is ejected conveyed along the substrate conveying path 21 to heat ink and exhausting water vapor generated by heating of ink, the hot air supplying part is provided at an outside the drying furnace 20 and configured to supply hot air into the substrate drying ducts 22, and the exhausting part is provided at the outside the drying furnace 20 and configured to exhaust air in the drying furnace 20 through the substrate drying ducts 22.