A washing machine, comprising: a washing and dewatering drum, for containing washings; an impeller, configured at a bottom of the washing and dewatering drum in a free rotation manner; a circulating water path, arranged on a side surface part of the washing and dewatering drum for enabling water delivered by rotation of the impeller to flow; a resinous water path forming member, configured to form the circulating water path between the resinous water path forming member and an inner circumferential wall of the washing and dewatering drum; a filter installation part, formed in the water path forming member; and a filter unit, installed on the filter installation part rotatably, and configured to suck water returning to the washing and dewatering drum from the circulating water path and water flowing along the inner circumferential wall through a water flow generated by rotation of the impeller, enable the water to pass, and collect lint and the like included in the passing water, wherein the filter installation part comprises a supporting shaft forming a rotating shaft of the filter unit and an opening part formed at a back of the supporting shaft and communicated with an interior of the circulating water path, and a wall part (210; 210B) reducing outflowing of water from the opening part is formed on a surface of the water path forming member facing a surface of the circulating water path towards a side of the inner circumferential wall; characterized in that the wall part (210; 210B) comprises a lower wall and a protruding part below the lower wall, wherein the protruding part has a shape of which a central part is more protruding towards an upstream side of the circulating water path than left and right ends. a washing and dewatering drum, for containing washings; an impeller, configured at a bottom of the washing and dewatering drum in a free rotation manner; a circulating water path, arranged on a side surface part of the washing and dewatering drum for enabling water delivered by rotation of the impeller to flow; a resinous water path forming member, configured to form the circulating water path between the resinous water path forming member and an inner circumferential wall of the washing and dewatering drum; a filter installation part, formed in the water path forming member; and a filter unit, installed on the filter installation part rotatably, and configured to suck water returning to the washing and dewatering drum from the circulating water path and water flowing along the inner circumferential wall through a water flow generated by rotation of the impeller, enable the water to pass, and collect lint and the like included in the passing water, wherein the filter installation part comprises a supporting shaft forming a rotating shaft of the filter unit and an opening part formed at a back of the supporting shaft and communicated with an interior of the circulating water path, and a wall part (210; 210B) reducing outflowing of water from the opening part is formed on a surface of the water path forming member facing a surface of the circulating water path towards a side of the inner circumferential wall; characterized in that the wall part (210; 210B) comprises a lower wall and a protruding part below the lower wall, wherein the protruding part has a shape of which a central part is more protruding towards an upstream side of the circulating water path than left and right ends.