To obtain a movable bathtub easy in transportation and capable of temporarily using at a camp, at the time of a disaster or at a constructing site by providing the bathtub in an involving container consisting of four surrounding side surfaces and upper/lower surfaces and having a freely openable and colorable entrance part at a one-side surface part.

The bathtub involving container 2 as a simply assembled bathroom for installing the bathtub 1 is provided. The container 2 consists of four surrounding side surfaces and the upper/lower surfaces and a freely openable and closable door 2a is installed at one surface of the four surrounding side surface parts. The bathtub 1 is attached with feeding device structured to be supplied water from a hot water supplying device and provided with a function for filtering impurity in addition and/or a drain purifying device with a function for purifying polluted water waste. Thereby, at the time of camping in mountains, etc., cold water including leaves of trees can be filtered to feed clean water to take a bath in the clean water and drain can be purified to prevent the pollution of rivers.