The results of implementation of rice seeder for wet seeded rice production technology with demonstration rice filed in planting season of 2011 showed that this technology was able to enhance the production efficiency of farmers because it reduced saved rice seeds for wet seeded rice production in large amount. Consequently, farmers were able to reduce the production cost of transplanting rice cultivation by 1,200-1,400 baht per rai, and reduce the production cost of broadcasting rice cultivation by 800-1,000 baht per rai. This research was conducted to study on its operational cost and to analyze breakeven and payback period of rice seeder technology in order to obtain engineering economic data for famers decision making on utilizing this technology. with actual wet seeded rice production. From the results of analyzing on economics by using Straight-Line Method in order to calculate its operational cost, it was found that the breakeven of this rice seeder for wet seeded rice production was 745.47 rai/year. When comparing with sowing operated by human labor, it was found that the breakeven of famers who utilized rice seeder for wet seeded rice production was 2.08 months. In other words, the breakeven could be reached within one planting season compared with the price of rice seeder at 120, 000 baht.