Electoral system for national legislature

Public Official Election Act (Act No. 13334, June. 19 2015)

Article 188
Decision on, Announcement and Notification of Elected Local Constituency National Assembly Members

188.1 In an election of a local constituency National Assembly member, the constituency election commission shall decide the person who has obtained a majority of the valid votes in the local constituency for the National Assembly member as the elected person: Provided, That if two or more persons have obtained the largest votes, the senior shall be decided as the elected person.

Article 189
Allocation of Seats of Proportional Representative National Assembly Members and Decision on, Announcement and Notification of Elected Persons

189.1 The National Election Commission shall allocate the seats of the proportional representative National Assembly members to each political party which has obtained 3/100 or more of the total valid votes in the election for a proportional representative National Assembly member or five or more seats in the general election for the local constituency National Assembly members (hereafter in this Article, referred to as the "seat-allocated party"), in proportion of the votes obtained by the relevant seat-allocated party in the election for the proportional representative National Assembly members.

189.2 Percentage of the obtained votes under paragraph (1) shall be calculated by dividing the number of votes obtained by a seat-allocated party by the total sum of votes obtained by all seat-allocated parties.

189.3 The seats of the proportional representative National Assembly members shall be first allocated to the relevant political party by an integral number of the numbers computed by multiplying the percentage of votes obtained by each seat-allocated party by the fixed number of seats of the proportional representative National Assembly members (hereafter in this Article referring to as the "seats"), and the remaining seats shall be allocated one by one to each political party in the descending order of less than a decimal point, but when the said number is equal, it shall be determined by lottery among the relevant political parties.