Supant made the comments as the first weekend of celebrations for Pride Month are being held, saying Pride Month symbolises the struggles of LGBTQ+ community over the past 50 years.
Equal marriage is among the 23 goals of the eight-party coalition, which includes Thai Sang Thai, that is trying to form the next government, he said.
There is no reason to discriminate against LGBTQ+ people, especially in the workplace or for marriage, he said.
Legalising same-sex marriage will also have economic benefits, said Supant, who chairs Thai Sang Thai’s economic committee.
Making same-sex unions legal will allow same-sex couples to buy property and operate businesses together, he explained. Many same-sex couples are wary of operating businesses together because there is no legal recognition of their union, he said.
Thailand is well-known globally as a friendly destination for LGBTQ+ tourists, so creating more activities for them will generate more revenue, he said. However, a lack of access to basic rights prevents many from visiting, he added.