Phanera japonica (Chinese: 日本羊蹄甲; pinyin: ri ben yang ti jia) is a species of flowering plant in the family Fabaceae which can be found in Guangdong, Hainan and Japan.

The leaf blade surface is shiny and hairless.

The species have three fertile stamens which are 11 millimetres (0.43 in) long and glabrous while the staminodes are two in number with silky hairs.

The seeds are black coloured and are shiny, ensiform, and 7 millimetres (0.28 in) long.

The flowers bloom from January to May while the fruits ripe from June to September.