PURPOSE: To easily house an air mat without folding in multiple by engaging an enfolding device with one side of the air mat set at a developed state, and enfolding the air mat in a drier main body from the one side.

CONSTITUTION: A hand-operated handle 28 is provided at one side bottom of the drier main body 17, and one end of an arbor 29 is connected to the hand- operated handle 28, and the other end is supported with an upper internal wall. The one side of the air mat 30 is engaged with the mandrel 29, and is wound on the mandrel. By employing such constitution, the air mat 30 can be expanded by pulling a draw-out handle 33 when drying is started. At this time, the mandrel 29 releases the winding of the air mat 30 as rotating. When the drying is completed, the air mat 30 is enfolded on the mandrel 29 by rotating the hand-operated handle 28.