Thailand’s Inventor Day is an international scale competition held by the National Research and Council of Thailand (NRCT). NRCT held Thailand’s Inventor Day 2018 as a challenge for participants to encourage them to solve abstract, difficult and hard problems with the tools they have through inventor competitions. Inventor is a competition to create ideas that are poured into activities that produce inventions, aimed at solving problems in society. This competition is open to all people in the world who care to work together to solve problems in society. Thailand’s inventor day 2018 was held at the BITEC (Bangkok International and Trade Center) on 2-6 February 2018 and 32 countries around the world were participated in and Indonesia was one of the participants.