The term dates from 1855. The term derives from the fact that they sit physically behind the frontbench in the House of Commons.

What does backbencher mean in government?

Backbenchers are members of parliament who are not ministers or shadow ministers; they sit in the rows of seats behind the frontbench. Most members of parliament start their parliamentary career as a backbencher. A promotion to the frontbench means not only a change in role but a change in seating.

What is a backbencher in Australia?

The term 'backbencher' refers to the Member's seating position in the Chamber of the House, where the front bench is occupied by Ministers and shadow ministers.