Steam bath have been popular worldwide recently for health reasons. The only drawback of a steam bath is the high service charge due to the expensive associated facilities. As such, a relatively cheap portable sauna enclosure has been commercially available as shown in FIG. 1. The sauna enclosure comprises a frame 1 including a plurality of interconnected vertical and horizontal bars, a canopy 2 covered on the frame 1 and stretched by it for forming a space to allow a person to take a bath therein, canopy 2 having three holes 201 for the neck and two arms extending through and a zipper 202 for permitting a person to enter the sauna enclosure when it is unfastened, a steamer 3 outside the sauna enclosure, and a steam pipe 4 connected between the steamer 3 and the inside of the sauna enclosure for transferring steam from steamer 3 to the sauna enclosure. The user should add water into steamer 3 for heating. After bathing, the user should use a dry cloth to absorb the condensed steam (i.e., water) in the sauna enclosure in order to forestall the growth of micro-organisms on the canopy 2.
However, the previous design suffered from several disadvantages. For example, it is still possible for steam to pass through holes 201 and zipper 202 during bathing due to the gaps between human body (i.e., neck and arms) and holes 201 as well as the gaps in the zipper 202 itself. As such, the leaked steam may be subsequently carried from the bathroom to the other rooms in the house, resulting in a potential damage to the household appliances, furniture, and wall due to humidity. In addition, the assembly and disassembly of frame 1 and steam pipe 4 is a tedious job. Also, the efficiency of steamer 3 may be adversely affected if the packing between steam pipe 4 and steamer 3 is not well sealed. Furthermore, the bulky steamer 4 is not easy to store when not in use. In view of this, its portability is adversely affected. Thus, it is desirable to provide an improved portable sauna enclosure in order to overcome the above drawbacks of the prior art.