The Chamber of Deputies (Spanish: Cámara de Diputados, pronounced [ˈkamaɾa ðe ðipuˈtaðos]) is the lower house of the Congress of the Union, the bicameral parliament of Mexico. The other chamber is the Senate. The structure and responsibilities of both chambers of Congress are defined in Articles 50 to 70 of the constitution.

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Quick Facts Chamber of Deputies Cámara de Diputados, Type ...

Chamber of Deputies Cámara de Diputados
LXV Legislature
Type
Type	Lower house of the Congress of Mexico
Term limits	Up to four consecutive terms; no limit to non-consecutive terms
History
Founded	4 October 1824 (1824-10-04)
Leadership
President	Marcela Guerra Castillo (PRI) since 1 September 2023
Structure
Seats	500
Political groups	Government (276)   MORENA (202)   PVEM (41)   PT (33) Opposition (220)   PAN (110)   PRI (69)   MC (28)   PRD (13)
Length of term	3 years
Elections
Voting system	Parallel voting 300 Seats elected by first-past-the-post 200 seats elected by largest remainder method[1]
Last election	6 June 2021 (2021-06-06)
Next election	2 June 2024 (2024-06-02)
Meeting place
Chamber of Deputies San Lázaro Legislative Building Mexico City Mexico
Website
Official website
Footnotes
Deputies information

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Bicameral legislature, including the Chamber of Deputies, was established on 4 October 1824. Unicameral Congress was in place from 7 September 1857 to 13 November 1874.^[2]

After being drafted, one copy of the Declaration of Independence of the Mexican Empire was given to the Provisional Governmental Board, which was later put on display in the s until 1909, when fire destroyed the location.^[3]

The Chamber of Deputies is composed of one federal representative (in Spanish: diputado federal) for every 200,000 citizens. The House has 500 members, elected using the parallel voting system. Elections are every 3 years.

Of these, 300 "majority deputies" are directly elected by plurality from single-member districts, the federal electoral districts (with each state divided into at least two districts). The remaining 200 "party deputies" are assigned through rules of proportional representation in 5 multi-state, 40-seat constituencies. These seats are not tied to districts; rather, they are allocated to parties based on each party's share of the national vote. The 200 party deputies are intended to counterbalance the sectional interests of the district-based representatives. Substitutes are elected at the same time as each deputy, so special elections are rare.

From 1917 to 2015, deputies were barred from serving consecutive terms in accordance with the Constitution's ban on immediate re-election to the legislature. Thus, the House of Representatives was one of the few legislative bodies in the world that was completely renewed at an election. However, this changed with the 2018 elections, and deputies are now permitted to run for re-election three times consecutively. A Representative who has served two terms may serve again after sitting out one term. Congressional elections held halfway into the president's six-year mandate are known as mid-term elections.

The current composition of the Chamber of Deputies is as follows:

• President of the Chamber of Deputies Directive Board
• Congress of Mexico
• Senate of Mexico
• Politics of Mexico
• Electoral regions of Mexico