The objective of this study was to examine the fear of COVID-19 virus regarding to the style of attachment, the perception of social support, the fear of losing a close person and the loss of loved ones experienced in childhood. The survey was conducted through an online survey of 240 adult respondents (77.9% of women) aged 18 to 59 (M=26.9; SD=8.4). Data analysis has shown that there is a significant (positive) correlation between the fear of COVID-19 virus and the fear of loss of a close person (r=0.634, p<0.01). Furthermore, in accordance with hypotheses, it has been found that people with an unsecure style of attachment are significantly more afraid of COVID-19 virus (M-W U=5857, p<0.05) and the loss of a close person (M-W U=5536, p>0.05) than people with a secure style of attachment. Contrary to expectations, significant childhood loss (M-W U=6247, p>0.05) and perceived social support (r=0.068, p>0.05) do not contribute to explaining the fear of COVID-19 virus. The research has contributed to a better insight into the complexity of the fear of COVID-19 virus and a better understanding of its determinants, which can help in better focusing on those people who need additional assistance and support in dealing with the fear of COVID-19 virus and the challenges during the pandemic.