Candidates
関 健一郎 — Aichi 15th District 2021
Updated 25 Tháng 5, 2026
- chevron_rightOutcome: Lost in Aichi 15th District (2021) — 80,776 votes (40.6%), rank #2 of 3.
- chevron_rightProfile: Male, age 43. Background: 政党役職. Status entering: Incumbent.
fact_check Quick Facts
Age
43 yrs
Gender
male ♂ Male
Election Date
Th10 31, 2021
System
Single-member
Seats Recorded
—
Election Performance
Vote Count & Share
Votes
80,776
Vote Share
40.6%
Rank
#2
Outcome
Lost
Win/Loss Outcome
Outcome
Did not win seat in 2021
Political Context
Party Affiliation
CDP
立民
Party Candidates 2021
253
Party Seats Won
96
Prefectures
58
Avg Share
39.0%
Occupation & Background
Category政党役職
Detail元ＮＨＫ記者、立憲民主党政務調査会長補佐
Incumbency & Career Wins
- Status entering the 2021 election: Incumbent
- Total recorded wins to date: 1
- Age at time of election: 43
Comparative Snapshot
Same District Rivals
| Rank | Candidate | Party | Votes | Share |
|---|---|---|---|---|
| #1 | 根本 幸典 | LDP | 104,204 | 52.4% |
| #2 | 関 健一郎 this page | CDP | 80,776 | 40.6% |
| #3 | 菅谷 竜 | Reiwa | 13,832 | 7.0% |
Same-Party Peers in 2021
- 島田 幸成 — Tokyo 25th District, 40.6% (Lost)
- 今井 瑠々 — Gifu 5th District, 40.5% (Lost)
- 牧 義夫 — Aichi 4th District, 40.8% (Lost)
- 池田 真紀 — Hokkaido 5th District, 40.3% (Lost)
- 西川 将人 — Hokkaido 6th District, 40.3% (Lost)
Candidates with Similar Vote Share
- 島田 幸成 (CDP, Tokyo 25th District) — 40.6%
- 宗清 皇一 (LDP, Osaka 13th District) — 40.6%
- 谷川 弥一 (LDP, Nagasaki 3rd District) — 40.7%
- 星野 剛士 (LDP, Kanagawa 12th District) — 40.7%
- 今井 瑠々 (CDP, Gifu 5th District) — 40.5%
Career Timeline
Elections
4
Career Wins
1
Total Votes
161,457
Best Vote Share
40.6%
| Year | District | Party | System | Votes | Share | Rank | Result |
|---|---|---|---|---|---|---|---|
| 2026 | Tokai Block (PR Block) | Ishin | PR Block | 0 | 0.0% | #15 | Won |
| 2026 | Aichi 15th District | Ishin | Single-member | 35,736 | 17.7% | #3 | Lost |
| 2024 | Aichi 15th District | Ishin | Single-member | 44,945 | 24.5% | #2 | Lost |
| 2021 | Aichi 15th District | CDP | Single-member | 80,776 | 40.6% | #2 | Lost |
Aichi 15th District Historical Context
| Year | Winner | Party | Winning Votes | Winning Share | Field Size | Margin |
|---|---|---|---|---|---|---|
| 2026 | 根本 幸典 | LDP | 88,028 | 43.6% | 6 | 51,414 |
| 2024 | 根本 幸典 | LDP | 71,012 | 38.7% | 5 | 26,067 |
| 2021 | 根本 幸典 | LDP | 104,204 | 52.4% | 3 | 23,428 |
Aichi Snapshot (2021)
Districts
15
Candidates
41
Seats Filled
15
Active Parties
8
Party representation across Aichi
LDP15 cand · 11 won
CDP13 cand · 3 won
JCP5 cand · 0 won
Ishin3 cand · 0 won
Reiwa2 cand · 0 won
NHK Party1 cand · 0 won
DPP1 cand · 1 won
Independent1 cand · 0 won
Top performers across Aichi (2021)
| Candidate | District | Party | Votes | Share | Result |
|---|---|---|---|---|---|
| 八木 哲也 | Aichi 11th District | LDP | 158,018 | 69.1% | Won |
| 鈴木 淳司 | Aichi 7th District | LDP | 144,725 | 54.7% | Won |
| 重徳 和彦 | Aichi 12th District | CDP | 142,536 | 52.7% | Won |
| 丹羽 秀樹 | Aichi 6th District | LDP | 136,168 | 58.3% | Won |
| 大西 健介 | Aichi 13th District | CDP | 134,033 | 52.7% | Won |
| 古川 元久 | Aichi 2nd District | DPP | 131,397 | 62.3% | Won |
| 青山 周平 | Aichi 12th District | LDP | 128,083 | 47.3% | Lost |
Where 関 健一郎 ranks
Among CDP single-member candidates in 2021
Higher vote share than 49.5% (106 of 214)
Among ALL single-member candidates in 2021
Higher vote share than 56.2% (482 of 857)
政党役職 cohort (2021)
Cohort Size
210
Cohort Wins
98
Cohort Avg Share
33.5%
Cohort Avg Age
56
関 健一郎's 40.6% vote share is 7.07 percentage points above the 政党役職 cohort average for 2021.
Frequently Asked Questions
How many times has 関 健一郎 run for the House of Representatives?expand_more
関 健一郎 has appeared in 4 recorded elections, winning 1 of them. The most recent was 2021.
Who has won Aichi 15th District in recent elections?expand_more
Recorded winners of Aichi 15th District: 根本 幸典 (2026); 根本 幸典 (2024); 根本 幸典 (2021).
How many Aichi districts ran candidates in 2021?expand_more
Aichi had 15 districts with 41 total candidates in 2021, of whom 15 won seats.
Did 関 健一郎 win the 2021 election?expand_more
関 健一郎 did not win the 2021 House of Representatives race in Aichi 15th District, recording 80,776 votes (40.6%).
Which party did 関 健一郎 represent?expand_more
関 健一郎 ran as a CDP candidate. The party fielded 253 candidates in 2021.
Who won Aichi 15th District in 2021?expand_more
根本 幸典 (LDP) won Aichi 15th District with 104,204 votes, a vote share of 52.4%.