Candidates
山口 晋 — Saitama 10th District 2021
Updated 25 Tháng 5, 2026
- chevron_rightOutcome: Won in Saitama 10th District (2021) — 96,153 votes (51.6%), rank #1 of 2.
- chevron_rightProfile: Male, age 38. Background: 政治スタッフ. Status entering: Newcomer.
- chevron_rightEndorsed by: 公明
fact_check Quick Facts
Age
38 yrs
Gender
male ♂ Male
Election Date
Th10 31, 2021
System
Single-member
Seats Recorded
1
Election Performance
Vote Count & Share
Votes
96,153
Vote Share
51.6%
Rank
#1
Outcome
Won
Win/Loss Outcome
Seat
Elected to the House of Representatives
Political Context
Party Affiliation
LDP
自民
Party Candidates 2021
351
Party Seats Won
261
Prefectures
58
Avg Share
51.1%
Occupation & Background
Category政治スタッフ
Detail元官房長官秘書官、元東京ガス社員
Incumbency & Career Wins
- Status entering the 2021 election: Newcomer
- Total recorded wins to date: 1
- Age at time of election: 38
Endorsements
公明
Comparative Snapshot
Same District Rivals
| Rank | Candidate | Party | Votes | Share |
|---|---|---|---|---|
| #1 | 山口 晋 this page | LDP | 96,153 | 51.6% |
| #2 | 坂本 祐之輔 | CDP | 90,214 | 48.4% |
Same-Party Peers in 2021
- 柴山 昌彦 — Saitama 8th District, 51.6% (Won)
- 三ツ林 裕己 — Saitama 14th District, 51.6% (Won)
- 井原 巧 — Ehime 3rd District, 51.6% (Won)
- 井出 庸生 — Nagano 3rd District, 51.5% (Won)
- 平 将明 — Tokyo 4th District, 51.5% (Won)
Candidates with Similar Vote Share
- 柴山 昌彦 (LDP, Saitama 8th District) — 51.6%
- 三ツ林 裕己 (LDP, Saitama 14th District) — 51.6%
- 井原 巧 (LDP, Ehime 3rd District) — 51.6%
- 山岡 達丸 (CDP, Hokkaido 9th District) — 51.5%
- 井出 庸生 (LDP, Nagano 3rd District) — 51.5%
Career Timeline
Elections
3
Career Wins
2
Total Votes
259,764
Best Vote Share
55.3%
| Year | District | Party | System | Votes | Share | Rank | Result |
|---|---|---|---|---|---|---|---|
| 2026 | Saitama 10th District | LDP | Single-member | 95,847 | 55.3% | #1 | Won |
| 2024 | Saitama 10th District | LDP | Single-member | 67,764 | 41.0% | #2 | Lost |
| 2021 | Saitama 10th District | LDP | Single-member | 96,153 | 51.6% | #1 | Won |
Saitama 10th District Historical Context
| Year | Winner | Party | Winning Votes | Winning Share | Field Size | Margin |
|---|---|---|---|---|---|---|
| 2026 | 山口 晋 | LDP | 95,847 | 55.3% | 2 | 18,362 |
| 2024 | 坂本 祐之輔 | CDP | 97,591 | 59.0% | 2 | 29,827 |
| 2021 | 山口 晋 | LDP | 96,153 | 51.6% | 2 | 5,939 |
Saitama Snapshot (2021)
Districts
15
Candidates
44
Seats Filled
15
Active Parties
7
Party representation across Saitama
LDP15 cand · 12 won
CDP11 cand · 3 won
JCP6 cand · 0 won
Independent5 cand · 0 won
Ishin4 cand · 0 won
DPP2 cand · 0 won
NHK Party1 cand · 0 won
Top performers across Saitama (2021)
| Candidate | District | Party | Votes | Share | Result |
|---|---|---|---|---|---|
| 大島 敦 | Saitama 6th District | CDP | 134,281 | 56.0% | Won |
| 黄川田 仁志 | Saitama 3rd District | LDP | 125,500 | 53.6% | Won |
| 新藤 義孝 | Saitama 2nd District | LDP | 121,543 | 52.8% | Won |
| 村井 英樹 | Saitama 1st District | LDP | 120,856 | 47.6% | Won |
| 大塚 拓 | Saitama 9th District | LDP | 117,002 | 53.4% | Won |
| 枝野 幸男 | Saitama 5th District | CDP | 113,615 | 51.4% | Won |
| 小泉 龍司 | Saitama 11th District | LDP | 111,810 | 61.9% | Won |
Where 山口 晋 ranks
Among LDP single-member candidates in 2021
Higher vote share than 54.5% (152 of 279)
Among ALL single-member candidates in 2021
Higher vote share than 80.5% (690 of 857)
政治スタッフ cohort (2021)
Cohort Size
43
Cohort Wins
3
Cohort Avg Share
28.4%
Cohort Avg Age
48
山口 晋's 51.6% vote share is 23.21 percentage points above the 政治スタッフ cohort average for 2021.
Frequently Asked Questions
How many times has 山口 晋 run for the House of Representatives?expand_more
山口 晋 has appeared in 3 recorded elections, winning 2 of them. The most recent was 2021.
Who has won Saitama 10th District in recent elections?expand_more
Recorded winners of Saitama 10th District: 山口 晋 (2026); 坂本 祐之輔 (2024); 山口 晋 (2021).
How many Saitama districts ran candidates in 2021?expand_more
Saitama had 15 districts with 44 total candidates in 2021, of whom 15 won seats.
Did 山口 晋 win the 2021 election?expand_more
山口 晋 won the 2021 House of Representatives race in Saitama 10th District, recording 96,153 votes (51.6%).
Which party did 山口 晋 represent?expand_more
山口 晋 ran as a LDP candidate. The party fielded 351 candidates in 2021.
Who won Saitama 10th District in 2021?expand_more
山口 晋 (LDP) won Saitama 10th District with 96,153 votes, a vote share of 51.6%.