The aim of the contribution is to examine how eligible voters in the 2020 parliamentary election perceive social justice in relation to the old-age pension system in the Slovak Republic. The sub-objective is to analyse possible significant differences in the perception of social justice among eligible voters in the 2020 parliamentary election in relation to the old-age pension system in terms of their political orientation. 701 respondents (349 women and 352 men) responded to questions asking about their political orientation as eligible voters in the parliamentary election in Slovakia in 2020 and the degree of perceived social justice in relation to the old-age pension system of the Slovak Republic. The results showed the fair distribution of deposits and returns is important for the respondents’ perception of social justice in relation to the old-age pension system of the Slovak Republic. The analyses showed that respondents with different political orientations had different opinions on the extent to which the calculation of the old-age pension should depend on the amount of income.