The carrying capacity of a natural park is generally determined by indicators of ecology, scenery and crowding. In addition to the above indicators, in mountainous natural parks where it is difficult to increase the number of more public toilets because of the complicated topography, the capacity of existing public toilets should be further considered. This study aims to compare the actual number of people passing public toilets with calculated capacities for women's toilets in the Oze area of Nikko National Park. Cases with and without waiting time were considered. The obtained results are as follows; 1) Since a woman spends on average one minute and 42 seconds using a toilet, a total of 35 women can use a toilet in one hour. 2) If women wait for five minutes to use the toilet, the majority feel uncomfortable. Moreover, if they wait for ten minutes, most of them feel very uncomfortable. 3) The actual number of visitors at around noon on the most crowded day of the year 2002 exceeded the calculated capacity at two of the four locations observed.
