Objective To determine the level and influencing factors of informal caregiver burden in gynaecological oncology inpatients receiving chemotherapy. Methods This cross-sectional study enrolled gynaecological oncology patients and their informal caregivers between May 2018 and November 2018 and measured the caregivers' burden using the Caregiver Burden Inventory. The influencing factors were evaluated with univariate regression analysis and multivariate linear stepwise regression analysis.