noun, takes genitive case の

  1. Japan's best, number one in Japan.

Variations

Pronunciation Kanji Kana Is Common
日本一 にほんいち
日本一 にっぽんいち

Contained Kanji Breakdown

day, sun, Japan
ひ にっ ニチ (1st, N5)
book, present, main
ホン もと まと (1st, N5)
tree, wood
き モク こ- (1st, N5)
one, one radical (no.1)
イチ いっ ひと- (1st, N5)