Piraeus B is a Greek election constituency that includes the Piraeus regional unit municipalities and Salamina. Concretely, this constituency includes the municipalities of Keratsini-Drapetsona, Nikaia-Agios Ioannis Renti, Korydallos, Perama and Salamina. It was created for the 1974 Greek parliament elections and currently elects 8 members of parliament. It is one of five electoral constituencies of the Attica region and former prefecture, along with Piraeus A, Athens A and Athens B, and Remainder of Attica. It was established in 1958, primarily to separate the heavily left-voting suburbs of Piraeus from the municipality of Piraeus and diminish the electoral power of the United Democratic Left.