Preschooler Gross Motor Quality Scale (PGMQ) was recently developed to evaluate motor skill quality of preschoolers. The purpose of this study was to establish the concurrent validity of PGMQ using Test of Gross Motor Development-2 (TGMD-2) as the gold standard. One hundred and thirty five preschool children aged from three to six years were recruited from three kindergartens in central Taiwan. Two independent evaluators who were unaware of each other's results evaluated all the children separately in their kindergartens using standardized setting and procedures. Concurrent validity was examined using correlation analysis with Pearson-Production Moment correlation coefficient. The results show that the total scores (r = 0.86, p less than 0.001) and subscale total scores (r = 0.82 for locomotion, r = 0.76 for object manipulation, p less than 0.001) of the two tests correlated well. Analysis of similar items in the locomotion subscale found significant but weak correlations in the running, jumping and galloping items of the two tests (r = 0.23-0.25, p less than 0.001). There were moderate to high correlations in hopping, sliding and leaping between the two tests (r = 0.52-0.70, p less than 0.001). Low to moderate correlations (r = 0.37-0.54, p less than 0.001) were found between the similar items in the object manipulation subscale of PGMQ and TGMD-2. Total scores of TGMD-2 also showed a high relation between the sum of the locomotion and object manipulation scores of PGMQ (r = 0.83, p less than 0.001). The total scores of similar items in the locomotion subscale of PGMQ and TGMD-2 showed a similar high relation (r = 0.79, p less than 0.001) likewise in the object manipulation subscale (r = 0.75, p less than 0.001) The PGMQ proved to have adequate concurrent validity with TGMD-2.