The Parliament was established by the British New Zealand Constitution Act 1852 which established a bicameral legislature, but the upper house, the Legislative Council, was abolished in 1951 so the legislature is now unicameral.
The Parliament was established by the British New Zealand Constitution Act 1852. This British New Zealand Constitution Act 1852 established a bicameral legislature. The upper house was abolished in 1951. The legislature is now unicameral. The Legislative Council was the upper house.