To provide a liquid hardening apparatus of a liquid transfer press achieved in space saving, low price and power saving.

A sheet-feed rotary press as the liquid transfer apparatus has an automatic feeder which feeds sheets of printing paper one by one as a material to be transferred, a printing part which prints the printing paper fed from the feeder by using ultraviolet ink as liquid hardening the printing paper fed from the automatic feeder, a paper delivery apparatus which delivers the printing paper printed with the printing part, and a drying apparatus provided between the printing part and the paper delivery apparatus. The drying apparatus 6 set to the printing press has many frames 21 arranged like checkers and an ultraviolet radiant diode 22 which does not radiate the light of a wavelength excepting an ultraviolet ray is provided at each part in those frames 21.