When can I start voting early?

Each election has a different period. Early voting will begin on the day following the date of public announcement. 16 days for members of the House of Councilors and prefectural governors, 14 days for heads of ordinance-designated cities, 11 days for members of the House of Representatives, 9 days for members of assemblies of ordinance-designated cities, 8 days for members of prefectural assemblies, mayors and city assemblies 6 days for councilors, 4 days for mayors and council members.