Candidates
佐々木 大成 — Iwate 1st District 2026
Updated 25 Tháng 5, 2026
- chevron_rightOutcome: Lost in Iwate 1st District (2026) — 12,233 votes (7.4%), rank #3 of 5.
- chevron_rightProfile: Male, age 47. Background: 経営者. 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
12,233
Vote Share
7.4%
Rank
#3
Outcome
Lost
Win/Loss Outcome
Outcome
Did not win seat in 2026
Political Context
Party Affiliation
Sanseito
参政
Party Candidates 2026
197
Party Seats Won
15
Prefectures
56
Avg Share
10.8%
Occupation & Background
Category経営者
Detail建設会社社長
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 | 階 猛 | Centrist | 73,209 | 44.2% |
| #2 | 米内 紘正 | LDP | 67,811 | 40.9% |
| #3 | 佐々木 大成 this page | Sanseito | 12,233 | 7.4% |
| #4 | 吉田 恭子 | JCP | 10,448 | 6.3% |
| #5 | 小笠原 勇治 | Independent | 2,080 | 1.3% |
Same-Party Peers in 2026
- 宇都 隆史 — Hokkaido 11th District, 7.4% (Lost)
- 大矢 寿乃 — Niigata 4th District, 7.3% (Lost)
- 立岡 昭是 — Osaka 13th District, 7.3% (Lost)
- 藤田 修一 — Kanagawa 18th District, 7.6% (Lost)
- 井上 直生 — Fukuoka 11th District, 7.2% (Lost)
Candidates with Similar Vote Share
- 宇都 隆史 (Sanseito, Hokkaido 11th District) — 7.4%
- 堤 淳太 (DPP, Oita 1st District) — 7.4%
- 松井 佳苗子 (JCP, Tokyo 26th District) — 7.4%
- 河野 一弘 (JCP, Fukuoka 6th District) — 7.5%
- 平岡 大介 (JCP, Hokkaido 2nd District) — 7.3%
Iwate 1st District Historical Context
| Year | Winner | Party | Winning Votes | Winning Share | Field Size | Margin |
|---|---|---|---|---|---|---|
| 2026 | 階 猛 | CENTRIST | 73,209 | 44.2% | 5 | 5,398 |
| 2024 | 階 猛 | CDP | 94,409 | 61.5% | 3 | 50,786 |
| 2021 | 階 猛 | CDP | 87,017 | 51.2% | 3 | 24,351 |
Iwate Snapshot (2026)
Districts
3
Candidates
10
Seats Filled
3
Active Parties
6
Party representation across Iwate
LDP3 cand · 2 won
Centrist2 cand · 1 won
Sanseito2 cand · 0 won
JCP1 cand · 0 won
Independent1 cand · 0 won
DPP1 cand · 0 won
Top performers across Iwate (2026)
| Candidate | District | Party | Votes | Share | Result |
|---|---|---|---|---|---|
| 鈴木 俊一 | Iwate 2nd District | LDP | 123,711 | 64.8% | Won |
| 藤原 崇 | Iwate 3rd District | LDP | 102,578 | 48.6% | Won |
| 小沢 一郎 | Iwate 3rd District | Centrist | 78,731 | 37.3% | Lost |
| 階 猛 | Iwate 1st District | Centrist | 73,209 | 44.2% | Won |
| 米内 紘正 | Iwate 1st District | LDP | 67,811 | 40.9% | Lost |
| 佐々木 真琴 | Iwate 2nd District | DPP | 67,294 | 35.2% | Lost |
| 及川 泰輔 | Iwate 3rd District | Sanseito | 29,831 | 14.1% | Lost |
Where 佐々木 大成 ranks
Among Sanseito single-member candidates in 2026
Higher vote share than 12.6% (23 of 182)
Among ALL single-member candidates in 2026
Higher vote share than 17% (190 of 1119)
経営者 cohort (2026)
Cohort Size
61
Cohort Wins
4
Cohort Avg Share
14.5%
Cohort Avg Age
47
佐々木 大成's 7.4% vote share is 7.07 percentage points below the 経営者 cohort average for 2026.
Frequently Asked Questions
Who has won Iwate 1st District in recent elections?expand_more
Recorded winners of Iwate 1st District: 階 猛 (2026); 階 猛 (2024); 階 猛 (2021).
How many Iwate districts ran candidates in 2026?expand_more
Iwate had 3 districts with 10 total candidates in 2026, of whom 3 won seats.
Did 佐々木 大成 win the 2026 election?expand_more
佐々木 大成 did not win the 2026 House of Representatives race in Iwate 1st District, recording 12,233 votes (7.4%).
Which party did 佐々木 大成 represent?expand_more
佐々木 大成 ran as a Sanseito candidate. The party fielded 197 candidates in 2026.
Who won Iwate 1st District in 2026?expand_more
階 猛 (Centrist) won Iwate 1st District with 73,209 votes, a vote share of 44.2%.