A drying device wherein, while transporting a long-sized printed object to which an ink has been applied by a printing part, the printed object is dried, comprising: a heating roller part capable of guiding the printed object and heating a rear surface of the printed object; 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; 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 for supplying air to the hot air blowing part through a supply opening formed on the chamber; an exhaust-use air blower 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 and the exhaust-use air blower are mounted, characterized in that the hot air blowing part is attached and fixed to the chamber, a cut-out part 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, and coupled to each other through the cut-out part into an integral unit, and in that a pair of rail parts extending in the width direction of the printed object 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, 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 and heating a rear surface of the printed object; 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; 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 for supplying air to the hot air blowing part through a supply opening formed on the chamber; an exhaust-use air blower 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 and the exhaust-use air blower are mounted, the hot air blowing part is attached and fixed to the chamber, a cut-out part 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, and coupled to each other through the cut-out part into an integral unit, and in that a pair of rail parts extending in the width direction of the printed object 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, 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.