Downstream, there is provided an upstream filter that can be used in wastewater treatment facilities. According to an aspect of the present invention, a filtering tank provided with a filter media layer and in which raw water flows upward; A raw water inlet pipe for supplying the raw water to a filtration tank; A distribution pipe provided at the lower end of the raw water inlet pipe to discharge raw water from the filtration tank; A treated water chamber through which filtered water from which raw water is filtered is introduced and discharged to the outside; An air lift pipe extending up and down in the filtration tank to move the filter medium in the lower portion of the filtration tank upward; A backwash chamber provided at an upper end of the air lift pipe, through which the backwash water moved upward through the air lift pipe is introduced and discharged to the outside; And a cleaning unit having a zigzag-shaped flow path, disposed under the backwash chamber, and discharging the filter medium transferred upward through the air lift pipe to the filtration tank, wherein the distribution pipe is for discharging the raw water to the filter medium layer. Including a plurality of discharge holes, the discharge hole is formed on the side of the distribution pipe, formed to discharge the raw water in the transverse direction in the filter media layer, an upward flow type filter may be provided.