Abstract: [Problem] To improve a strength and productivity of a filter having a filtration member in a pleated shape. [Solution] A filter (40) includes a filtration member (41) having partitioned surfaces (43) that are partitioned by mountain-fold pleats (42) and valley-fold pleats (42), and end plates (48, 49) fixed to two end portions of the filtration member (41) and configured to maintain the filtration member (41) in a pleated shape. The filtration member (41) includes a plurality of filtration portions (45a, 45b, and 45c) and intermediate portions (46a, 46b) each provided between the adjacent filtration portions. In the filtration portions (45), an angle formed by the adjacent partitioned surfaces (43, 43) is greater than 0°, and in the intermediate portions (46a, 46b), an angle formed by the adjacent partitioned surfaces (43, 43) is 0°.