noun
Baseball term referring to the area of the field inside the bases, or the four infielders collectively. Often contrasted with 外野 (outfield).
See also: 内野
彼はインフィールドの守備がうまい。
He is good at infield defense.
打球がインフィールドを抜けて外野へ転がった。
The batted ball went through the infield and rolled into the outfield.