A bogie having a caster attached to the inside of a dryer body can be introduced into a dryer through a front portion of a lower plate closely adhered on a ground in a state in which the bogie is moved on the ground without a separate lifting operation, And a bogie entry and exit part having a heat insulation structure in the dryer to improve the heat insulation efficiency in the dryer by inserting the bottom plate of the main body into and out of the bogie without interfering with the entrance and exit of the bogie, Dryer. In order to achieve this, the present invention is characterized in that the left and right side plates 11 and 12, the upper plate 13, the lower plate 14, the rear plate 15 and the front door 17 are provided to form a rectangular parallelepiped case, The left and right side plates 11 and 12, the upper plate 13, the back plate 15 and the front door 17 of the dryer body 10 are provided with a blowing fan 20 for introducing outside air into the case. The upper and lower plates 11 and 12 and the heat insulating material 30 are provided on the inner surfaces of the left and right side plates 11 and 12. The lower plate 14 is in close contact with the paper surface 2, (41, 42) spaced apart from each other in the longitudinal direction (30)； A fixing bracket 58 installed at a lower end of one of the both side perforated plates 41 and 42 on the side of the front door 17； The bottom plate 14 is formed to have a length corresponding to the front length of the lower plate 14 and is connected to the fixing bracket 58 by an axial pivot 62 to be rotated between the one of the perforated plate 42 and the front portion of the lower plate 14 The other end 60b of the bottom insulating bar 60 is connected to the lower bracket 58 by the shaft pin 62 and the other end 60b of the bottom insulating bar 60 is connected to the bottom plate 14, The front side of the lower plate 14 of the dryer main body 10 is opened and closed while the lower side of the bottom side of the
