At the party's first general election in 1957, the PSP won 10.41% of the total votes and 19 seats in the Lok Sabha. However, the party's vote share continued to decline over the next few elections. It won 6.81% of the total votes and 12 seats in the Lok Sabha in 1962, 3.06% of the total votes and 13 seats in the Lok Sabha in 1967 and only 1.04% of the total votes and only 2 seats in the Lok Sabha in 1971.
