Candidates
山岸 一生 — Tokyo 9th District 2021
Updated 25 Tháng 5, 2026
- chevron_rightOutcome: Won in Tokyo 9th District (2021) — 109,489 votes (40.9%), rank #1 of 4.
- chevron_rightProfile: Male, age 40. Background: 記者. Status entering: Newcomer.
- chevron_rightEndorsed by: 社民都連合
fact_check Quick Facts
Age
40 yrs
Gender
male ♂ Male
Election Date
Th10 31, 2021
System
Single-member
Seats Recorded
1
Election Performance
Vote Count & Share
Votes
109,489
Vote Share
40.9%
Rank
#1
Outcome
Won
Win/Loss Outcome
Seat
Elected to the House of Representatives
Political Context
Party Affiliation
CDP
立民
Party Candidates 2021
253
Party Seats Won
96
Prefectures
58
Avg Share
39.0%
Occupation & Background
Category記者
Detail元朝日新聞記者
Incumbency & Career Wins
- Status entering the 2021 election: Newcomer
- Total recorded wins to date: 1
- Age at time of election: 40
Endorsements
社民都連合
Comparative Snapshot
Same District Rivals
| Rank | Candidate | Party | Votes | Share |
|---|---|---|---|---|
| #1 | 山岸 一生 this page | CDP | 109,489 | 40.9% |
| #2 | 安藤 高夫 | LDP | 95,284 | 35.6% |
| #3 | 南 純 | Ishin | 47,842 | 17.9% |
| #4 | 小林 興起 | やまと | 15,091 | 5.6% |
Same-Party Peers in 2021
- 牧 義夫 — Aichi 4th District, 40.8% (Lost)
- 手塚 仁雄 — Tokyo 5th District, 41.0% (Won)
- 鈴木 庸介 — Tokyo 10th District, 41.1% (Lost)
- 岡本 章子 — Miyagi 1st District, 41.2% (Lost)
- 島田 幸成 — Tokyo 25th District, 40.6% (Lost)
Candidates with Similar Vote Share
- 関 芳弘 (LDP, Hyogo 3rd District) — 40.9%
- 船橋 利実 (LDP, Hokkaido 1st District) — 41.0%
- 宮崎 政久 (LDP, Okinawa 2nd District) — 41.0%
- 牧 義夫 (CDP, Aichi 4th District) — 40.8%
- 手塚 仁雄 (CDP, Tokyo 5th District) — 41.0%
Career Timeline
Elections
3
Career Wins
2
Total Votes
241,138
Best Vote Share
44.1%
| Year | District | Party | System | Votes | Share | Rank | Result |
|---|---|---|---|---|---|---|---|
| 2026 | Tokyo 9th District | Centrist | Single-member | 56,175 | 30.6% | #2 | Lost |
| 2024 | Tokyo 9th District | CDP | Single-member | 75,474 | 44.1% | #1 | Won |
| 2021 | Tokyo 9th District | CDP | Single-member | 109,489 | 40.9% | #1 | Won |
Tokyo 9th District Historical Context
| Year | Winner | Party | Winning Votes | Winning Share | Field Size | Margin |
|---|---|---|---|---|---|---|
| 2026 | 菅原 一秀 | LDP | 78,927 | 43.0% | 4 | 22,752 |
| 2024 | 山岸 一生 | CDP | 75,474 | 44.1% | 4 | 10,676 |
| 2021 | 山岸 一生 | CDP | 109,489 | 40.9% | 4 | 14,205 |
Tokyo Snapshot (2021)
Districts
25
Candidates
96
Seats Filled
25
Active Parties
13
Party representation across Tokyo
LDP24 cand · 16 won
CDP20 cand · 8 won
Ishin17 cand · 0 won
Independent14 cand · 0 won
JCP9 cand · 0 won
NHK Party3 cand · 0 won
DPP2 cand · 0 won
Reiwa2 cand · 0 won
Komeito1 cand · 1 won
第一1 cand · 0 won
SDP1 cand · 0 won
やまと1 cand · 0 won
Minor Parties1 cand · 0 won
Top performers across Tokyo (2021)
| Candidate | District | Party | Votes | Share | Result |
|---|---|---|---|---|---|
| 萩生田 光一 | Tokyo 24th District | LDP | 149,152 | 58.5% | Won |
| 吉田 晴美 | Tokyo 8th District | CDP | 137,341 | 48.4% | Won |
| 小倉 將信 | Tokyo 23rd District | LDP | 133,206 | 51.2% | Won |
| 井上 信治 | Tokyo 25th District | LDP | 131,430 | 59.4% | Won |
| 伊藤 達也 | Tokyo 22nd District | LDP | 131,351 | 46.9% | Won |
| 平 将明 | Tokyo 4th District | LDP | 128,708 | 51.5% | Won |
| 伊藤 俊輔 | Tokyo 23rd District | CDP | 126,732 | 48.8% | Lost |
Where 山岸 一生 ranks
Among CDP single-member candidates in 2021
Higher vote share than 50.9% (109 of 214)
Among ALL single-member candidates in 2021
Higher vote share than 56.9% (488 of 857)
記者 cohort (2021)
Cohort Size
16
Cohort Wins
5
Cohort Avg Share
33.1%
Cohort Avg Age
48
山岸 一生's 40.9% vote share is 7.85 percentage points above the 記者 cohort average for 2021.
Frequently Asked Questions
How many times has 山岸 一生 run for the House of Representatives?expand_more
山岸 一生 has appeared in 3 recorded elections, winning 2 of them. The most recent was 2021.
Who has won Tokyo 9th District in recent elections?expand_more
Recorded winners of Tokyo 9th District: 菅原 一秀 (2026); 山岸 一生 (2024); 山岸 一生 (2021).
How many Tokyo districts ran candidates in 2021?expand_more
Tokyo had 25 districts with 96 total candidates in 2021, of whom 25 won seats.
Did 山岸 一生 win the 2021 election?expand_more
山岸 一生 won the 2021 House of Representatives race in Tokyo 9th District, recording 109,489 votes (40.9%).
Which party did 山岸 一生 represent?expand_more
山岸 一生 ran as a CDP candidate. The party fielded 253 candidates in 2021.
Who won Tokyo 9th District in 2021?expand_more
山岸 一生 (CDP) won Tokyo 9th District with 109,489 votes, a vote share of 40.9%.