How to say "ballpark" in Japanese

• 球場きゅうじょうCommon
  nounCovers the literal sense: the baseball stadium or ballpark as an actual place. This is the common word, the one you want when talking about going to a game or where a team plays.
  私は、甲子園こうしえん球場きゅうじょうに行いく。↗

  I go to Koshien stadium.
• 野球場やきゅうじょう
  nounAlso the literal venue — a baseball field, ground or stadium, with the sport named in full — but a less common word; for 'ballpark' in ordinary use, 球場 is usually the word you want.
  我々われわれの野球場やきゅうじょうは非常ひじょうに狭せまい。↗

  Our baseball diamond is very small.

Both words translate only the literal sense of 'ballpark', the baseball venue itself; 球場 is the common everyday word, 野球場 a less common, more explicit alternative, and neither fits the figurative 'ballpark figure' sense.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 球場きゅうじょうbaseball stadium
• 野球場やきゅうじょうbaseball ground