second-generation Diet member; hereditary politician
Refers to a member of the Japanese Diet (parliament) who inherited a political base from a parent, often a former Diet member. Carries a nuance of political dynasty or hereditary succession.
See also: 世襲議員
As a second-generation Diet member, he inherited his father's political base.
There is criticism that the increase in hereditary politicians undermines political diversity.
世襲議員 is a broader term for hereditary politicians, while 二世議員 specifically refers to second-generation members who directly succeeded a parent.
Compound of 二世 (nisei, 'second generation') and 議員 (giin, 'member of an assembly').