Kazuki Oiwa

Oiwa's current-season form is down 79% on last season (Season 14→3), while his Rating eased 15→5. His peak season for form remains 2021/22 (Season 23).

Domestic career

Season	Club	Apps	G	A	Match	RTG	Season
2025/26	Shonan Bellmare · 19th	15	1	0	6.7	5	3
2024/25	Shonan Bellmare · 15th	22	0	3	6.8	15	14
2023/24	Shonan Bellmare · 15th	26	1	1	6.71	18	18
2022/23	Shonan Bellmare · 12th	18	0	0	6.82	20	22
2021/22	Shonan Bellmare · 16th	25	1	0	6.76	23	23

Domestic-league totals per season. RTG = Field Insider Rating (potential / ceiling); Season = age-blind form that year. 9 earlier seasons in the full career.

Japan · international

Side	Apps	G
Japan U20	3	0

Career caps & goals — tournament breakdown in the full career.

Scout report

Experienced headCentral defender

K. Oiwa is a 37-year-old central defender at Shonan Bellmare, rated 5 overall by Field Insider's model. A seasoned veteran, he has been a fringe squad member this season (19.4% of available minutes). His defensive output reads 1.77 tackles, blocks and interceptions per 90. Below: strengths, watch-points, market-value outlook and the latest transfer news on Oiwa.

On the season, Oiwa graded 3 for current form (age-blind), on 1 clean sheet and 1.765 defensive actions per 90.

Year-on-year, that's a drop on last season (Season 14 → 3). Over the 6 seasons on record his form has drifted down, peaking in 2021/22.

On long-term talent our Rating reads 5. At 37 Oiwa is into the veteran stage, where the age curve weighs on the projection, and a market index of 0.4 reflects that trajectory.

From the career report

Read the full career report →

Past his 2021/22 peak — the recent trend is downward, so buyers are paying for what's left, not what was.

Peak: 2021/22Trending downRemarkably consistent

Ratingi

below regular-starter level

3.2

Seasoni

below regular-starter level

19.4%

Minutes

limited game time

1.77

Def. actions / 90

light defensive volume

Output in context · Shonan Bellmare finished 19th of 20 · a relegation-threatened side

Apps

1.77

Def. / 90

Tackles

Interceptions

Clean sheets

1.77 tackles, blocks & interceptions per 90 — light defensive volume, with 1 clean sheet across 15 appearances. Doing that for a relegation-threatened side (19th of 20) is harder than the bare numbers suggest: a back line under more pressure has to defend more often and protects fewer leads, so the volume — and any clean sheets — carry real weight. Going forward he chipped in 1 goal and 0 assists — a useful bonus from the back.

Watch points

Game time. Only 19.4% of available minutes — needs a settled run to prove the level.
Age curve. At 37, both level and resale value are on the downslope.
Level. Rates below a nailed-on top-tier starter on our model.

Outlook

Rated 5 overall — below regular-starter level. Defensively he reads as light defensive volume (1.77 tackles, blocks & interceptions per 90). Veteran phase — a short-term, lower-fee proposition as both level and value decline (0.5× and falling).

Generated from Field Insider's rating model · AI-written analysis to follow.

Per 90 & availability

Minutes played %19.4%

Available fixtures38 of 38

Goals / 900.136

Assists / 900

Goal contribution / 900.136

Defensive actions / 901.765

Player flow

Goal involvements1

Cards / 900.136

Season-by-season progression

Rating (potential)Season (form)

Value & potential by age

Market valueRating

Solid = now · dashed = projected

The gold line is market value — an index (not €) blending rating, age and league. It climbs through the early 20s, peaks around ages 23–27 (~1), then tapers with age. At 37, Oiwa sits on 0.4, past its peak and easing. The blue line is Oiwa's projected Rating — 5 today — recomputed at each age, so it follows the same rise-and-fall as a career matures and declines. Solid = up to today; dashed = projected.

Season statistics

Bars = where he ranks among centre-backs in the J3 League with 600+ minutes this season.

Shooting

Goals1

Passing

Assists0

Defending

Tackles10

Interceptions1

Blocks2

Yellow/red cards

Yellow cards1

Red cards0

Transfer history

Renofa YamaguchiJan 2026 – now-

Shonan BellmareJan 2020 – Jan 2026Free

Vegalta SendaiJan 2016 – Jan 2020

JEF United Chibauntil Jan 2016

About K. Oiwa

Kazuki Oiwa is a 36-year-old centre-back who plays for Renofa Yamaguchi, born on August 17, 1989 in Nagoya, standing 183 cm tall. He is from Japan. Renofa Yamaguchi currently sit 13th of 20 in the J3 League.

This season

In the current season, K. Oiwa has made 15 appearances with 1 goal and 0 assists across 663 minutes, with 1 yellow card.

K. Oiwa's next match is on August 30, 2026, when Renofa Yamaguchi face Osaka at home in the J3 League.

Field Insider's view

Field Insider currently rates K. Oiwa at 5 with a Season form score of 3.2. See the full scout report for strengths, watch-points and the market-value outlook.

Career

Across 14 recorded seasons, K. Oiwa has totalled 373 club appearances with 18 goals and 5 assists for 3 different clubs. His busiest campaign came in 2014/15, with 38 appearances for JEF United Chiba.

K. Oiwa's career has also included time at Shonan Bellmare, Vegalta Sendai and JEF United Chiba.

On the international stage, K. Oiwa has represented Japan U20 — 3 caps in our records.

Transfer news

No transfer news found for this player.

Profile

Season stats

Also this season

Career

Scout report

Output in context · Shonan Bellmare finished 19th of 20 · a relegation-threatened side

Watch points