NPB Rules Quick Reference
First-line answers to questions like "How many players are on the bench?" and "How many extra innings are played?". Figures are verified against primary sources such as official NPB releases, and each page shows its verification date.
- NPB Active Roster: 31 Registered Players, 26 on the Bench - Breakdown and History As of the 2026 season, each NPB club can register up to 31 players on its active roster, of whom 26 can be on the bench for a given game. A quick reference covering the layers from the 70-man reserve list down to the starting nine, the foreign-player limit, and how the cap grew from 28 to 29 to 31. Verified: 2026-07-26
- NPB Extra Innings: Games End After the 12th - Rules for the Season, CS, and Japan Series NPB regular-season games in both leagues go at most 12 innings; if still tied, the game ends in a draw (no tiebreaker). The Climax Series is also capped at 12, while the Japan Series allows 12 innings through Game 7 and unlimited innings from Game 8. Includes the verified history, such as the 10-inning cap in 2020 and no extra innings in 2021. Verified: 2026-07-26
- Is There a Midnight Rule in NPB? - How Late Can Games Run? NPB games are not cut off by the clock at midnight: what ends a game is the 12-inning limit, and games have in fact continued past midnight (such as a 6-hour-26-minute game in 1992 that ended at 12:26 a.m.). This page also covers the time limits that did exist in the past, like the 3.5-hour rule of 2011-2012, all checked against primary sources. Verified: 2026-07-26
- Ejection Rules in NPB - What Happens After the Call In NPB, an ejection is a sanction called by the umpires: the ejected player, manager, or coach must leave the game immediately. The game itself continues - a substitute takes the player's place and a coach takes over for an ejected manager. An ejection alone carries no suspension; fines or further discipline can follow for serious cases. A quick reference with the underlying rules and real examples. Verified: 2026-07-26
Each page reflects the rules as of its verification date. If rules change mid-season, please check the date and sources.
Record Tracker
Current numbers and progress are available on the tracker pages, tallied from official npb.jp records.