PURPOSE: To dry a bath mat wetted with water thoroughly within a short period of time by employing a connecting member for freely detachably connecting the outer circumferential surface of the hot air blow out hole of a hot air duct to one end opening of the bath mat.

CONSTITUTION: A hot air generator 1 is started and kept running by means of an operating section 2. When a first person coming out of a bathroom A wipes the person's feet with a bath mat 8 while the person wipes the person's body with a bath towel, 5-30 grams of water is absorbed to the mat 8. Because the hot air generator 1 is already working, hot air generated is led through a hot air duct 5 and a hot air outlet 6 and from an opening 10 at one end of the bath mat 8 is fed into the bath mat 8, and the water absorbed with the bath mat 8 is rapidly dried while the mat is moved up and down with the hot air flow. If the hot air generator 1 of the bath mat device is housed within the wall 14 of the bathroom A and the hot air duct 5 is embedded below the door frame 13b at the lower part of a bathroom door frame 13 in a built-in constitution, the space in the changing room B is efficiently used free from projecting obstruction.