  This study examines the influence of grandchildren's gender on grandparents'
voting behavior using independently collected individual-level data. The survey
was conducted immediately after the House of Councilors election in Japan. I
observed that individuals with a granddaughter were more likely to vote for
female candidates by around 10 % than those without. However, having a daughter
did not affect the parents' voting behavior. Furthermore, having a son or a
grandson did not influence grandparents' voting behavior. This implies that
grandparents voted for their granddaughter's future benefit because
granddaughters may be too young vote in a male-dominated and aging society.
