FILTER UNIT

摘要

A filter unit (3) includes a housing (161), a housing (162), a filter member (164), and a packing (165A). The housings (161) and (162) are joined to each other liquid-tightly. The filter member (164) and the packing (165A) are disposed so as to be sandwiched between the housing (161) and the housing (162). The housing (161) is formed with a projection (167) located outside a portion of the housing (161) which is contacted by the O-ring. The housing (162) is formed with a recess (166) for receiving the projection (167) therein. A sealing material (168) is provided between the projection (167) and the recess (166).