The 1987 Portuguese legislative election took place on 19 July. The election renewed all 250 members of the Assembly of the Republic.

Quick Facts 250 seats to the Portuguese Assembly 126 seats needed for a majority, Registered ...

1987 Portuguese legislative election

← 1985 19 July 1987 1991 →
250 seats to the Portuguese Assembly 126 seats needed for a majority
Registered	7,930,668 1.4%
Turnout	5,676,358 (71.6%) 2.6 pp
First party Second party Third party   Leader Aníbal Cavaco Silva Vítor Constâncio Álvaro Cunhal Party PSD PS PCP Alliance CDU Leader since 2 June 1985 29 June 1986 30 September 1987 Leader's seat Lisbon[1] Lisbon[2] Lisbon Last election 88 seats, 29.9% 57 seats, 20.8% 38 seats, 15.5% Seats won 148 60 31 Seat change 60 3 7 Popular vote 2,850,784 1,262,506 689,137 Percentage 50.2% 22.2% 12.1% Swing 20.3 pp 1.4 pp 3.4 pp   Fourth party Fifth party   Leader Ramalho Eanes Adriano Moreira Party PRD CDS–PP Leader since 29 April 1986 13 April 1986 Leader's seat Lisbon Lisbon Last election 45 seats, 17.9% 22 seats, 10.0% Seats won 7 4 Seat change 38 18 Popular vote 278,561 251,987 Percentage 4.9% 4.4% Swing 13.0 pp 5.6 pp
Vote winner strength by district Results by constituency
Prime Minister before election Aníbal Cavaco Silva PSD Prime Minister after election Aníbal Cavaco Silva PSD

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In the previous election, in 1985, the Social Democratic Party had won a minority government managing to survive in coalition with the Democratic and Social Center and the Democratic Renewal Party, and after the approval of a no-confidence motion from the left-wing parties, with the aid of the Democratic Renewal Party, the government fell. The PS tried to form a new government with the support of the PRD and CDU, but Mário Soares, the President at the time, rejected the idea and called for a new election.^[3]

The PSD was reelected in a landslide, winning a majority government with just over 50% of the votes and 148 of the 250 seats, a majority of 46. Not only was this the most seats that a Portuguese party had ever won in a free election, but it was first time since the Carnation Revolution that a single party won an absolute majority. Although the PSD was very popular going into the election, the size of its victory far exceeded the party's most optimistic expectations. The PSD won every district with the exception of Setúbal, Évora and Beja, which voted for the CDU.

The Socialist Party gained a few seats and got a slightly higher share of the vote, 22% compared with the almost 21% in 1985, but the scale of the PSD victory made the party lose most of its influence. Like in 1979, 1980 and 1985, the PS failed to win a single district. The left-wing Democratic Unity Coalition lost some of its MPs to the Socialist Party and the Democratic Renewal Party, now led by former President António Ramalho Eanes, lost almost all of its influence, mainly due to its responsibility in the fall of the former PSD minority government. The right-wing Democratic and Social Center lost almost half of its vote share, due to the effect of tactical voting for the also right-wing, Social Democratic Party.

European elections were held on the same day.

The Assembly of the Republic has 250 members elected to four-year terms. Governments do not require absolute majority support of the Assembly to hold office, as even if the number of opposers of government is larger than that of the supporters, the number of opposers still needs to be equal or greater than 126 (absolute majority) for both the Government's Programme to be rejected or for a motion of no confidence to be approved.^[16]

The number of seats assigned to each district depends on the district magnitude.^[17] The use of the d'Hondt method makes for a higher effective threshold than certain other allocation methods such as the Hare quota or Sainte-Laguë method, which are more generous to small parties.^[18]

For these elections, and compared with the 1985 elections, the MPs distributed by districts were the following:^[19]

The table below lists the parties represented in the Assembly of the Republic during the 4th legislature (1985–1987) and that also partook in the election:

The following table shows the opinion polls of voting intention of the Portuguese voters before the election. Those parties that are listed were represented in parliament (1985-1987). Included is also the result of the Portuguese general elections in 1985 and 1987 for reference.

  Exit poll

More information Date Released, Polling Firm ...

Date Released	Polling Firm		PS				Others	Lead
19 Jul 1987	Leg. election	50.2 148	22.2 60	4.9 7	12.1 31	4.4 4	6.2 0	28.0
19 Jul 1987	RTP1	48.0–50.0	21.0–23.0	5.0–7.0	12.5–14.5	3.0–5.0	–	27.0
19 Jul 1987	Antena1	45.0–47.0	24.0–25.0	–	–	–	–	21.0–22.0
17 Jul 1987	Euroexpansão/Expresso	41.0–44.0	22.0–25.0	11.0–14.0	13.0–15.0	4.0–6.0	–	19.0
9 Oct 1986	Tempo	35.6	24.8	9.2	—	9.8	–	10.8
15 Dec 1985	Local elections	34.2	27.6	4.7	19.6	9.8	4.1	6.6
6 Oct 1985	Leg. election	29.9 88	20.8 57	17.9 45	15.5 38	10.0 22	5.9 0	9.1

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