Early intervention for preschoolers with Attention-Deficit Hyperactivity Disorder (ADHD) is important considering the impact on their prognosis. Parent-Child Interaction Therapy (PCIT) is a psychotherapy treatment for the parent-child dyad and has been shown to be effective for children with disruptive behaviors. We present the treatment course of PCIT for two Japanese children with ADHD. Case 1 is a 2-year-old female child with hyperactivity and aggressiveness. Case 2 is a 4-year-old male child with restlessness and intolerability to daily events. For both cases, PCIT was effective in improving the problematic behaviors. PCIT may serve as a treatment option for Japanese children with ADHD.

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