member of the House of Representatives; lower house member
Refers specifically to a member of the 衆議院 (House of Representatives), the lower house of Japan's National Diet.
He was elected as a member of the House of Representatives.
The term of a lower house member is four years, but it ends earlier if the house is dissolved.
Refers to a member of the 参議院 (House of Councillors), the upper house of the Diet, as opposed to the lower house.
A general term for any member of the National Diet, encompassing both lower and upper house members.
Compound of 衆院 (shūin, abbreviation of 衆議院 'House of Representatives') and 議員 (giin, 'member of an assembly').