Achieving herd immunity against COVID-19 through vaccination is considered an important strategy for controlling the epidemic. However, as is the case for other infectious diseases, many people are hesitant to vaccinate. Underestimating the risk of disease, inconvenience of the inoculation process, concerns about effectiveness and safety, autonomy and personal belief, lack of altruism, and antipathy are psychosocial factors that lead to vaccine hesitancy. It is important to acknowledge and understand these concerns and fears rather than criticize individuals. To achieve herd immunity, the government must provide accurate information and improve accessibility through various windows to encourage individuals to make reasoned decisions.