This study aims to test the validity and reliability of the TGMD III test instrument for measurement gross motor skill Indonesia Children. The research was conducted in July August 2023, with upper class students at state elementary school 1 of Piyungan, IDEA Kalasan Elementary School, and state elementary school of Bendungan as subjects. The sample selection technique uses Random Sampling, selected students in each class are randomly selected, bringing a total of 290 students. Validity evaluation of the agility test used empirical and content validities. Based on the empirical validity test of the Pearson moment product, the r table is 0.444, r count (test 1) is 0.819, r count (test 2) is 0.819, significance value is 0.000. If the r count is bigger than the r table and the significance value is < 0.05, it can be concluded that the result is valid. Based on the reliability test using Cronbach alpha, the r table is 0.444, Cronbach alpha is 0.99. If the Cronbach alpha value is greater than the r table, the result TGMD III instrument to measurement Gross motor skill in Indonesia Children can be said to be reliable. So that the TGMD III test has high validity and reliability results, considered valid and reliable. Trust, the TGMD III test has been fit and proper to be used to measure Gross motor skill test. it can be used for measurements in the framework of collecting data on early childhood gross motor skills in Indonesia.