A drying device (H) wherein, while transporting a long-sized printed object (X) to which an ink has been applied by a printing part , the printed object (X) is dried, comprising: a heating roller part capable of guiding the printed object (X) and heating a rear surface of the printed object (X); a hot air blowing part that is formed so as to be opposed to an outer circumferential surface of the heating roller part , and used for blowing hot air to a printing surface of the printed object (X); a chamber in which the heating roller part and the hot air blowing part are housed; a first plate frame and a second plate frame installed on two sides of the chamber so as to sandwich the chamber ; a supply-use air blower (D1) for supplying air to the hot air blowing part through a supply opening formed on the chamber ; an exhaust-use air blower (D2) for exhausting air inside the chamber through an exhaust opening formed on the chamber ; and a stage part on which the supply-use air blower (D1) and the exhaust-use air blower (D2) are mounted, characterized in that the hot air blowing part is attached and fixed to the chamber , a cut-out part (K) through which the chamber is allowed to pass is formed on the second plate frame , and the chamber and the stage part are installed side by side in a width direction of the printed object (X), and coupled to each other through the cut-out part (K) into an integral unit, and in that a pair of rail parts extending in the width direction of the printed object (X) are formed on the first plate frame and second plate frame so as to cross-link the first plate frame and second plate frame and also to pass through the cut-out part (K), and the chamber and the stage part are allowed to slide along the rail parts (La, La1) between a heating and drying position at which the chamber is located between the first plate frame and the second plate frame , and a stand-by position at which the chamber is located at a position where at least one portion of the heating roller part is exposed. a heating roller part capable of guiding the printed object (X) and heating a rear surface of the printed object (X); a hot air blowing part that is formed so as to be opposed to an outer circumferential surface of the heating roller part , and used for blowing hot air to a printing surface of the printed object (X); a chamber in which the heating roller part and the hot air blowing part are housed; a first plate frame and a second plate frame installed on two sides of the chamber so as to sandwich the chamber ; a supply-use air blower (D1) for supplying air to the hot air blowing part through a supply opening formed on the chamber ; an exhaust-use air blower (D2) for exhausting air inside the chamber through an exhaust opening formed on the chamber ; and a stage part on which the supply-use air blower (D1) and the exhaust-use air blower (D2) are mounted, the hot air blowing part is attached and fixed to the chamber , a cut-out part (K) through which the chamber is allowed to pass is formed on the second plate frame , and the chamber and the stage part are installed side by side in a width direction of the printed object (X), and coupled to each other through the cut-out part (K) into an integral unit, and in that a pair of rail parts extending in the width direction of the printed object (X) are formed on the first plate frame and second plate frame so as to cross-link the first plate frame and second plate frame and also to pass through the cut-out part (K), and the chamber and the stage part are allowed to slide along the rail parts (La, La1) between a heating and drying position at which the chamber is located between the first plate frame and the second plate frame , and a stand-by position at which the chamber is located at a position where at least one portion of the heating roller part is exposed. <EOS>