Naoya (岡本直也) Okamoto
ID 181530
Born : 1975 Cat. M50 Ultrarunner since 2002 JPN
71
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
80
DUV-index+ ?Largest integer N such that the race distances provide at least N complete segments of N km in total. A single long race may therefore contribute several segments. See the DUV-Index tab for the detailed calculation. calculation details
3
Countries visited ?JPNJapanNZLNew ZealandUSAUnited States
13,7%
Rank quotient ?This runner's calculation uses 97 eligible race(s): Σ(rank − 1) = 7 508; Σ finishers = 54 820. 7 508 / 54 820 × 100 = 13.70%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed97
Km — ultra races10 000 km
> 100 km36
> 160 km27
Longest race170,3 km
4th Ultra-Trail Mt. Fuji (UTMF) — 25/9/2015

Km per year (ultra races)

910
9 races
2022
1 026
10 races
2023
1 018
8 races
2024
874
7 races
2025
658
6 races
2026

Race types (share of distance)

Road26,7%
Trail73,3%

Wins & podiums (ultra)

🏆 Win1
🏆 Win M2
🏅 Top 39
🏅 Top 3 M9
Longest winning streak1
Current streak0

Records

50 km6h00'52100 km8h06'1150 mi6h37'06100 mi18h09'23

HISTORY

97 race(s)
DateRacePerf.Rk
2026
18.07 100mi USA25th Tahoe Rim Trail 100M Endurance Run 29:15:32 h31
14.06 100km JPN5. OSJ Aizu Bandaisan Ultramarathon - 100 km 9:46:47 h17
17.05 68km JPN32th Yatsugatake Nobeyama 68 km 6:11:08 h4
16.05 102km JPN5th Kobe Akashi Ultra Marathon 23:21:07 h137
21.03 100mi NZL14th Northburn Station 100 Miler Mountain Run 34:21:36 h24
17.01 5h JPN13th Iikoto Challenge - 5h 65.672 km2 🥈
2025
12.10 111km JPN2nd North Ontake Ultra 9:49:23 h2 🥈
13.09 162.2km JPN17th Shinetsu Five Mountains Trail 100 mile 28:27:43 h75
19.07 100mi JPN17th OSJ Ontake 100 Mile Ultra Trail 19:54:12 h24
21.06 105km JPN1st Kaga Spa by UTMB - Kaga Spa Trail Endurance100 19:58:15 h75
07.06 100km JPN4. OSJ Aizu Bandaisan Ultramarathon - 100 km 9:47:27 h23
18.05 68km JPN31th Yatsugatake Nobeyama 68 km 6:00:31 h6
25.04 167km JPN10th Ultra-Trail Mt. Fuji 38:04:11 h564
2024
16.11 100mi JPN10th FunTrails100M Round 30:47:11 h29
12.10 100mi JPN10th OSJ Koumi 100 26:37:53 h11
15.09 100km JPN22th Tango 100 km Ultramarathon 9:21:09 h32
13.07 100mi JPN16th OSJ Ontake 100 Mile Ultra Trail 21:48:15 h37
15.06 100km JPN3. OSJ Aizu Bandaisan Ultramarathon - 100 km 9:14:53 h6
19.05 68km JPN30th Yatsugatake Nobeyama 68 km 5:26:23 h5
26.04 167km JPN9th Ultra-Trail Mt. Fuji 29:01:28 h94
10.03 100km JPN6th Ibaraki 100k Ultra Marathon 8:47:50 h24
2023
17.12 70km JPN1st Coast to Coast Boso hanto 7:20:52 h12
18.11 54km JPN6th Geki Zaka 54 km 4:35:27 h5
07.10 100mi JPN9th OSJ Koumi 100 32:40:21 h31
17.09 100km JPN21th Tango 100 km Ultramarathon 10:26:55 h74
15.07 100mi JPN15th OSJ Ontake 100 Mile Ultra Trail 19:54:38 h8
04.06 100km JPN2. OSJ Aizu Bandaisan Ultramarathon - 100 km 8:49:42 h4
21.05 71km JPN29th Yatsugatake Nobeyama 71 km 5:28:57 h2 🥈
21.04 167km JPN8th Ultra-Trail Mt. Fuji 32:49:17 h353
16.04 62km JPN33th Fuji 3 Lakes 62 km Challenge 5:43:46 h28
25.03 80km JPN4th Tokyo Katsushika Ultra Marathon - 80km 6:37:06 h1 🏆
2022
19.11 54km JPN5th Geki Zaka 54 km 4:32:14 h5
06.11 50km JPN6th Koshu Alps Lily Route Challenge 7:35:23 h7
17.09 162.6km JPN14th Shinetsu Five Mountains Trail 100 mile 32:30:38 h175
12.06 100km JPN16th Iwate Ginga 100km Marathon Challenge 8:37:44 h23
05.06 100km JPN1. OSJ Aizu Bandaisan Ultramarathon - 100 km 8:06:11 h5
22.05 71km JPN28th Yatsugatake Nobeyama 71 km 5:22:06 h3 🥉
22.04 167km JPN7th Ultra-Trail Mt. Fuji 27:15:55 h145
13.03 100km JPN4th Ibaraki 100k Ultra Marathon 8:39:28 h18
11.02 105km JPN1st Kobe Akashi Ultra Marathon 23:21:04 h52
2021
05.12 100km JPN1st Tokyo Edogawa Ultra Marathon - 100 km 8:52:54 h22
10.10 100km JPN25th 100 km Ultramarathon Ako Seaside Park 9:26:29 h6
28.08 75km JPN1st Okushinano 100 - 75 km 10:09:00 h53
2019
03.11 50km JPN3rd Koshu Alps Lily Route Challenge 7:40:55 h13
25.08 48km JPN6th Tsukuba Renjyo 48 km Road & Trail Run 4:42:48 h3 🥉
13.07 100mi JPN12th OSJ Ontake 100 Mile Ultra Trail 19:36:17 h8
02.06 78km JPN26. Ultramarathon Okumusashi 6:15:39 h18
19.05 71km JPN25th Yatsugatake Nobeyama 71 km 5:43:57 h2 🥈
26.04 167km JPN6th Ultra-Trail Mt. Fuji 29:37:38 h88
2018
04.11 50km JPN2nd Koshu Alps Lily Route Challenge 7:01:41 h7
06.10 100mi JPN5th OSJ Koumi 100 30:03:06 h10
20.05 71km JPN24th Yatsugatake Nobeyama 71 km 6:04:07 h7
27.04 170km JPN5th Ultra-Trail Mt. Fuji 28:24:27 h54
2017
19.11 47km JPN1st Koshu Alps Lily Route Challenge 6:03:42 h2 🥈
07.10 100mi JPN4th OSJ Koumi 100 28:45:46 h18
10.09 50km JPN10th OSJ Adatara Trail 50K 9:42:38 h15
15.07 100mi JPN10th OSJ Ontake 100 Mile Ultra Trail 20:17:32 h14
04.06 78km JPN24. Ultramarathon Okumusashi 6:25:27 h26
21.05 71km JPN23rd Yatsugatake Nobeyama 71 km 5:52:24 h4
2016
13.11 50km JPN8th Kanna Mountain Run II 6:22:45 h9
22.10 60km JPN3rd Shigakogen Extreme Trail 6:58:14 h14
09.10 71.5km JPN24th Hasetsune Cup - Japan Mountain Endurance Race 10:37:24 h77
16.07 100mi JPN9th OSJ Ontake 100 Mile Ultra Trail 19:03:43 h8
22.05 100km JPN22nd Yatsugatake Nobeyama 100 km 9:43:51 h47
24.04 118km JPN26th Fuji 5 Lakes 118 km Challenge 12:27:40 h113
09.04 70km JPN11th Toda Saiko 70 km 5:48:39 h10
2015
08.11 50km JPN7th Kanna Mountain Run 6:00:52 h3 🥉
31.10 71.5km JPN23rd Hasetsune Cup - Japan Mountain Endurance Race 9:36:53 h68
25.09 170.3km JPN4th Ultra-Trail Mt. Fuji 29:47:46 h58
29.08 100km JPNKISO Great Traverse 100 km Ultra Marathon 9:30:00 h10
15.03 72km JPN2nd Izu Trail Journey 10:21:21 h195
2014
12.10 71.5km JPN22nd Hasetsune Cup - Japan Mountain Endurance Race 9:43:01 h81
19.07 100mi JPN7th OSJ Ontake 100 Mile Ultra Trail 18:09:23 h6
25.04 100mi JPN3rd Ultra-Trail Mt. Fuji 31:09:45 h103
2013
10.11 50km JPN5th Kanna Mountain Run II 6:02:44 h7
13.10 71.5km JPN21st Hasetsune Cup - Japan Mountain Endurance Race 9:49:58 h80
13.07 100mi JPN6th OSJ Ontake 100 Mile Ultra Trail 19:43:01 h6
26.04 100mi JPN2nd Ultra-Trail Mount Fuji 29:00:27 h77
10.03 72km JPN1st Izu Trail Journey 9:25:22 h127
2012
03.11 100mi JPN1st OSJ Yatsugatake Super Trail 100 miles race 27:38:01 h48
07.10 71.5km JPN20th Hasetsune Cup - Japan Mountain Endurance Race 10:46:40 h141
16.09 110km JPN4th Shinetsu Five Mountains Trail 110km 16:38:14 h84
18.05 156km JPN1st Ultra-Trail Mount Fuji 33:43:27 h113
22.04 112km JPN22nd Fuji 5 Lakes 112 km Challenge 10:17:30 h18
2011
09.10 71.5km JPN19th Hasetsune Cup - Japan Mountain Endurance Race 11:24:44 h157
24.09 110km JPN3rd Shinetsu Five Mountains Trail 110km 15:08:05 h44
2010
10.10 71.5km JPN18th Hasetsune Cup - Japan Mountain Endurance Race 12:45:12 h236
18.07 100km JPN3rd OSJ Ontake 100km Ultra Trail 13:20:22 h57
2009
11.10 71.5km JPN17th Hasetsune Cup - Japan Mountain Endurance Race 11:31:31 h172
19.07 100km JPN2nd OSJ Ontake 100km Ultra Trail 16:37:27 h237
2008
12.10 71.5km JPN16th Hasetsune Cup - Japan Mountain Endurance Race 14:58:37 h613
2007
14.10 71.5km JPN15th Hasetsune Cup - Japan Mountain Endurance Race 15:10:51 h519
27.05 50km JPNOSJ Hakone 50K 11:01:16 h275
2006
08.10 71.5km JPN14th Hasetsune Cup - Japan Mountain Endurance Race 16:44:04 h600
2005
09.10 71.5km JPN13th Hasetsune Cup - Japan Mountain Endurance Race 16:41:59 h360
18.09 100km JPN5th Tango 100 km Ultramarathon 12:09:04 h113
2002
12.10 71.5km JPN10th Hasetsune Cup - Japan Mountain Endurance Race 15:19:39 h176