Background: It has been recognized that keeping relationships with society and other people, such as through social participation, is important to maintaining health in the elderly. We aimed to determine changes in the social participation of the elderly from before and during the COVID-19 pandemic, and to compare differences in this status by gender.Methods: We conducted a cross-sectional questionnaire survey in a single city in Ibaraki Prefecture, Japan. The questionnaires were sent by mail to 3,000 people aged 65 to 85 years randomly selected by the administrative staff of the city. Responses were obtained on the basic attributes of the participants (age, gender, working status, residential status), as well as their economic status, daily physical activity, and social participation status at three time points: (1) before the COVID-19 pandemic in January 2020; (2) immediately prior to the declaration of a state of emergency in April 2020; and (3) one year after (1), namely January 2021.Results: A total of 1,301 people responded to the survey. Mean age was 73.3 (SD 5.5) years, and 690 (53.0%) were female. Significant gender differences were seen in living alone, currently working, and amount of physical activity. The number of people reporting social participation gradually decreased, from 543 respondents (41.7%) at (1), 319 (24.5%) at (2) and 251 (19.3%) at (3). On comparison by gender, a significant difference in social participation status was seen at (1), but not at (2) or (3).Conclusions: The percentage of social participation among elderly decreased during the pandemic. The rate of decrease was particularly large among women.