Candidates
大西 健太郎 — Tokyo 20th District 2026
Updated 25 Tháng 5, 2026
- chevron_rightOutcome: Lost in Tokyo 20th District (2026) — 46,910 votes (20.9%), rank #2 of 4.
- chevron_rightProfile: Male, age 47. Background: その他. Status entering: Newcomer.
fact_check Quick Facts
Age
47 yrs
Gender
male ♂ Male
Election Date
Th10 22, 2026
System
Single-member
Seats Recorded
—
Election Performance
Vote Count & Share
Votes
46,910
Vote Share
20.9%
Rank
#2
Outcome
Lost
Win/Loss Outcome
Outcome
Did not win seat in 2026
Political Context
Party Affiliation
DPP
国民
Party Candidates 2026
122
Party Seats Won
28
Prefectures
55
Avg Share
21.5%
Occupation & Background
Categoryその他
Detail元高校教諭
Incumbency & Career Wins
- Status entering the 2026 election: Newcomer
- Age at time of election: 47
Comparative Snapshot
Same District Rivals
| Rank | Candidate | Party | Votes | Share |
|---|---|---|---|---|
| #1 | 木原 誠二 | LDP | 108,985 | 48.6% |
| #2 | 大西 健太郎 this page | DPP | 46,910 | 20.9% |
| #3 | 宮本 徹 | JCP | 45,031 | 20.1% |
| #4 | 掛山 茂希 | Sanseito | 23,544 | 10.5% |
Same-Party Peers in 2026
- 川元 健一 — Fukuoka 5th District, 21.0% (Lost)
- 西岡 義高 — Kanagawa 18th District, 21.1% (Lost)
- 中村 太一 — Kanagawa 17th District, 20.7% (Lost)
- 山口 翔平 — Kanagawa 10th District, 20.5% (Lost)
- 向山 好一 — Hyogo 3rd District, 21.4% (Lost)
Candidates with Similar Vote Share
- 丸尾 圭祐 (Centrist, Fukuoka 1st District) — 20.9%
- 川元 健一 (DPP, Fukuoka 5th District) — 21.0%
- 落合 拓磨 (Centrist, Yamagata 3rd District) — 20.8%
- 空本 誠喜 (Ishin, Hiroshima 4th District) — 20.8%
- 西岡 義高 (DPP, Kanagawa 18th District) — 21.1%
Career Timeline
Elections
2
Career Wins
0
Total Votes
112,345
Best Vote Share
30.1%
| Year | District | Party | System | Votes | Share | Rank | Result |
|---|---|---|---|---|---|---|---|
| 2026 | Tokyo 20th District | DPP | Single-member | 46,910 | 20.9% | #2 | Lost |
| 2024 | Tokyo 20th District | DPP | Single-member | 65,435 | 30.1% | #2 | Lost |
Tokyo 20th District Historical Context
| Year | Winner | Party | Winning Votes | Winning Share | Field Size | Margin |
|---|---|---|---|---|---|---|
| 2026 | 木原 誠二 | LDP | 108,985 | 48.6% | 4 | 62,075 |
| 2024 | 木原 誠二 | LDP | 93,390 | 43.0% | 3 | 27,955 |
| 2021 | 木原 誠二 | LDP | 121,621 | 52.6% | 3 | 55,105 |
Tokyo Snapshot (2026)
Districts
30
Candidates
154
Seats Filled
30
Active Parties
12
Party representation across Tokyo
LDP30 cand · 30 won
Sanseito30 cand · 0 won
DPP27 cand · 0 won
Centrist24 cand · 0 won
JCP13 cand · 0 won
Ishin11 cand · 0 won
Minor Parties6 cand · 0 won
Independent4 cand · 0 won
Mirai3 cand · 0 won
保守2 cand · 0 won
減ゆ2 cand · 0 won
Reiwa2 cand · 0 won
Top performers across Tokyo (2026)
| Candidate | District | Party | Votes | Share | Result |
|---|---|---|---|---|---|
| 伊藤 達也 | Tokyo 22nd District | LDP | 132,689 | 51.5% | Won |
| 鈴木 隼人 | Tokyo 10th District | LDP | 126,044 | 49.1% | Won |
| 福田 かおる | Tokyo 18th District | LDP | 117,383 | 47.7% | Won |
| 平 将明 | Tokyo 4th District | LDP | 114,054 | 49.4% | Won |
| 長島 昭久 | Tokyo 30th District | LDP | 110,453 | 45.2% | Won |
| 松島 みどり | Tokyo 14th District | LDP | 109,892 | 50.2% | Won |
| 井上 信治 | Tokyo 25th District | LDP | 109,606 | 50.5% | Won |
Where 大西 健太郎 ranks
Among DPP single-member candidates in 2026
Higher vote share than 59.8% (61 of 102)
Among ALL single-member candidates in 2026
Higher vote share than 51.6% (577 of 1119)
その他 cohort (2026)
Cohort Size
224
Cohort Wins
17
Cohort Avg Share
15.0%
Cohort Avg Age
51
大西 健太郎's 20.9% vote share is 5.92 percentage points above the その他 cohort average for 2026.
Frequently Asked Questions
How many times has 大西 健太郎 run for the House of Representatives?expand_more
大西 健太郎 has appeared in 2 recorded elections, winning 0 of them. The most recent was 2026.
Who has won Tokyo 20th District in recent elections?expand_more
Recorded winners of Tokyo 20th District: 木原 誠二 (2026); 木原 誠二 (2024); 木原 誠二 (2021).
How many Tokyo districts ran candidates in 2026?expand_more
Tokyo had 30 districts with 154 total candidates in 2026, of whom 30 won seats.
Did 大西 健太郎 win the 2026 election?expand_more
大西 健太郎 did not win the 2026 House of Representatives race in Tokyo 20th District, recording 46,910 votes (20.9%).
Which party did 大西 健太郎 represent?expand_more
大西 健太郎 ran as a DPP candidate. The party fielded 122 candidates in 2026.
Who won Tokyo 20th District in 2026?expand_more
木原 誠二 (LDP) won Tokyo 20th District with 108,985 votes, a vote share of 48.6%.