PURPOSE: To secure a minimum ventilation flue and prevent the thermal transfor mation, etc., of a connection hose even when the neck is twisted or pressed by arranging a shape retainer inside the neck part for connecting the connection hose of the dryer body to the mat body.

CONSTITUTION: When a dryer body 9 is driven, hot blast is blown out of an blowout port after being introduced into the ventilation flue 4 of a mat body 1 through a neck 2 from a connection hose 10, whereby the futon (Japanese bedding) folded inside the mat body 1 is dried. In this case, a form retainer 6 is arranged in the range from the neck 2 to the inside of the mat body 1 in its vicinity. And, the form retainer 6 is made in trough shape out of synthetic resin or the like, and also ventilation ports 7 are bored severally in both sidewalls of the rear half inserted in the section of the mat body 1. Hereby, even if the neck 2 is twisted or pressed, a minimum ventilation flue 4 is secured. Accordingly, the thermal transformation, etc., of the connection hose 10 can be prevented.