Manufacturing method for a filter

摘要

A filter portion of a filter (1) includes a plurality of bag-like members (3). The bag-like members (3) are formed in a container shape having an opening and disposed with intervals therebetween. The periphery of the opening of each bag-like member (3) is supported by a supporting member (2), and the bag-like members (3) are mutually connected by the supporting member (2). Consequently, the strength of the filter portion comprising the bag-like members (3) is improved.