Provided is a technique which can be used to provide a service with a higher health promoting effect than conventional ceramic plate baths. In a warm bath system 1, a warm bath device 10 is installed in a service providing space 5. A housing 400 of the warm bath device 10 accommodates a tatami mat 100, a heating sheet 200, an insulation member 300 with a surface layer member 110 of the tatami mat 100 being exposed from an opening 410. A core 120 of the tatami mat 100 contains a liquid that includes multiple types of predetermined bacteria. The warm bath device 10 warms the tatami mat 100 with the heat from the heating sheet 200 and promotes release of the bacteria outside of the core 120. By using this warm bath device 10, the users body is warmed and the released multiple types of predetermined bacteria are introduced into the users body.
