We developed an evaluation system for soft neurological signs by pronosupination of forearm using wireless acceleration and angular velocity sensors. We could obtain reference curves of the neuromotor development for elementary school children using this system. The purpose of this system is screening the developmental disorder. We measured the pronosupination of five children suspected of having ADHD (children aged 7-12). We examined the difference of neuromotor development between normally developed children and children suspected of having ADHD. Measured results show children suspected of having ADHD have low performance compared with normally developed child.