To provide a clean working table which prevents gases from leaking to the inside of a working chamber by collecting the gases utilizing the air-cleaning function of the working table if the gases are discharged from a container containing the gases when volatile chemicals, which are harmful for a human body, such as formalin are handled on the clean working table provided with the air-cleaning function.

The container 21 accommodating the volatile chemicals such as formalin is housed in a housing space 5 at the lower part 4 of the working table. Since an exhaust passage 7 formed between the upper part 2 of the working table and its lower part 4 is connected to an exhaust system 6, the gases leaked from the container 21 is forcedly flowed in the exhaust passage 7 through an opening part 24 of a partition part 23 from a gap 22 to be collected by an HEPA (high efficiency particulate air) filter 12 of the exhaust system 6, and opening and closing of a door 20 of the housing space 5 can be linked to an exhaust capacity. When the working table is used as a pathological working table for handling a pathological tissue 19, prevention of an infection, improvement of a working space 3 and excellent maintenance of the environment of the working chamber can be realized.