To turn a scraper conveyer in synchronization with an apron conveyer by receiving a turning force of the apron conveyer, in a filtration apparatus including the apron conveyer arranged in an upper stage and the scraper conveyer arranged in a lower stage.

In the filtration apparatus including the apron conveyer 6 arranged in the upper stage and the scraper conveyer 12 arranged in the lower stage, a sprocket with a greater diameter is coaxially fixed to a following sprocket 5 that turnably suspends the apron conveyer so that the rotation of the sprocket with the greater diameter is transmitted to the rotation of the scraper conveyer.