A pressing diaphragm and a pressing filter plate of a compression type filter press in which a surface of a main body of a pressing filter plate is covered with the pressing diaphragm, include: a projection member provided on the surface; and a projection member mounting member capable of contacting the main body, provided in a rear surface at a position corresponding to the projection member, and for mounting the projection member thereon with a fixture. The projection member has a plurality of pillar portions mounted on the projection member mounting member and fitted in a through-hole of the pressing diaphragm, a mounting hole penetrating through each of the pillar portions, and a long connecting plate portion for connecting the pillar portions with each other and regulating expansion of the pressing diaphragm fitted into a periphery of the pillar portions. The projection member mounting member has a mounting portion for mounting the fixture to be inserted into the mounting hole of each pillar portion of the projection member.
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