This study is focused on the assumption that the analyses focused on sustainable human resource management (HRM) should include the problem of unstable forms of employment. Reference was also made to Poland, the country where the share of unstable forms of employment is the highest in the European Union. The authors based their findings on the literature and the data published, i.e., by Eurostat, OECD and Statistics Poland, accompanied by CSR reports. Insecure forms of employment have negative

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... mpact on employees' health, primarily regarding their mental health. Statistically significant correlations were found between the expectation rate of possible job loss and non-standard employment variables, and the rate of reporting exposure to risk factors that affect mental wellbeing and precarious employment rates. However, conducting statistical analyses at the macro level is associated with limitations resulting from leaving out many important factors characteristic of the given countries and affecting the presented data. Current guidelines, relevant to reporting the use of non-standard forms of employment by enterprises, are inconsistent. Companies voluntarily demonstrate the scope of using non-permanent forms of employment and not referring to the issue of employees' choice of a given type of employment and employees' health. Future research projects should be focused on developing a comprehensive, coherent and universal tool allowing for an assessment of the implementation level of sustainable HRM ideas in an organization, including standardized reporting of non-permanent employment and employees' health, and making comparisons not only between organizations, but also between countries.