Overview
- Both courts, issuing rulings Tuesday, found the February 8 vote constitutional and rejected lawsuits seeking to void the results.
- Voters backed by a lawyers’ group brought coordinated challenges nationwide, and these are the first judgments among 16 suits filed across 14 high courts.
- The largest gap in vote weight reached 2.10 times, with Hokkaido’s 3rd district compared with Tottori’s 1st, edging up from 2.06 in 2024.
- The election used the Adams method, a seat-allocation formula meant to better match seats to population, and this was the second contest run under that system.
- Plaintiffs said roughly twofold gaps show the map lacks rationality, while prefectural election boards argued the disparity was not severe enough to undermine the system’s reasonableness.