Filter and centrifugal blower

A filter, comprising:

• a filtration member in which mountain-fold pleats and valley-fold pleats are alternately formed and that has a partitioned surface partitioned by the mountain-fold pleat and the valley-fold pleat;
• and
• end plates fixed to two end portions of the filtration member in a direction in which the mountain-fold pleats and the valley-fold pleats extend and configured to maintain the filtration member in a pleated shape,
• wherein the filtration member includes a plurality of filtration portions and intermediate portions each provided between the adjacent filtration portions, the plurality of filtration portions and the intermediate portions being arranged along a direction in which the mountain-fold pleats and the valley-fold pleats are arranged and each including a plurality of the partitioned surfaces,
• wherein in the filtration portions, an angle formed by the adjacent partitioned surfaces is greater than 0°, and
• wherein in the intermediate portions, an angle formed by the adjacent partitioned surfaces is 0°.