The was a monetary unit of Japan. The Ichibuban could be either made of silver or gold, in which case it was a quarter of a Koban.

The gold Ichibuban of 1714 (佐渡一分判金) had a weight of 4.5 g, with 85.6% of gold and 14.2% of silver. The silver Ichibuban from 1837 to 1854 (Tenpō

Tenpo

was a , also known as Tempō, after Bunsei and before Kōka. The period spanned the years from December 1830 through December 1844...

 Ichibugin, 天保一分銀 , "Old Ichibuban") weighed 8.66 g, with an alloy of 0.21% gold and 98.86% silver.

The Nibuban (二分判) was worth double the Ichibuban, and half a Koban and was also a rectangular coin.

Gold Ichibuban (一分判金)

File:Keicho-1buban.jpg|Keichō

Keicho

was a after Bunroku and before Genna. This period spanned from October 1596 to July 1615. The reigning emperors were and .-Change of era:* 1596 : The era name was changed to Keichō to mark the passing of various natural disasters...

 Ichibuban
File:Shotokukoki-1buban.jpg|Kyōhō

Kyoho

was a after Shōtoku and before Gembun. This period spanned the years from July 1716 through April 1736. The reigning emperors were and .-Change of era:...

 Ichibuban
File:Bunzi-1buban.jpg|Genbun Ichibuban
File:Hozi-1buban.jpg|Bunsei

Bunsei

was a after Bunka and before Tenpō. This period spanned the years from April 1818 through December 1830. The reigning emperor was .-Change of era:...

 Ichibuban
File:Hozi-1buban.jpg|Tenpō

Tenpo

was a , also known as Tempō, after Bunsei and before Kōka. The period spanned the years from December 1830 through December 1844...

Ichibuban