Background Previous studies have revealed an association between maternal depressive/anxious symptoms and children’s tics. However, the longitudinal relationship between these symptoms remains unclear. We examined the longitudinal relationships between maternal depressive/anxious symptoms and children’s tics across early adolescence in a population-based sample. Methods Participants were 3,171 children and their mothers from the Tokyo Teen Cohort study (TTC), a population-representative longitudinal study launched in Tokyo in 2012. Maternal depressive/anxious symptoms and children’s tics were examined using self-report questionnaires at the ages of 10 (time 1, T1) and 12 (time 2, T2). A cross-lagged model was used to explore the relationships between maternal depressive/anxious symptoms and children’s tics. Results As maternal depressive/anxious symptoms at T1 were greater, their children at T2 were more likely to have tics (β = .06, p = .001). Furthermore, the presence of tics at T1 was positively related to maternal depressive/anxious symptoms at T2 (β = .06, p = .001). Conclusions These findings suggest a longitudinal bidirectional relationship between maternal depressive/anxious symptoms and children’s tics during early adolescence which may exacerbate each other over time and possibly create a vicious circle. When an early adolescent has tics, it might be important to identify and care for maternal depressive/anxious symptoms.