The title of this research is Increasing Student Learning Interst at Math Learning by using Inquiry Method at Grade 5th Students in SDN 20 Mungguk Pasir, Toba, Sanggau. The aim of this research is to reveal the increasing effect of students learning interest in math Learning by using inquiry Method at Grade 5th of SDN 20 Mungguk Pasir, Toba, Sanggau in overcoming the less of student interest in math Learning. The research Method uses descriptive and qualitative by research planing class action that consict of 2 cycles. Each of the cycles are done 2 times meeting namely planning , action, action implementation , obsevation and reflection to action. The subyect of this research is teacher of the class and the 5th students which total 21 students. Tecnique that used is observation and direct communication . The result of the research and discussion is concluded as follow: feeling aspect is increased to 18 % . Confidence aspects 14% and emotional aspects have increased 12%