This study clarified differences in mental health, psychosocial status, and mental health-related factors among mothers of ADHD children between those with and without maternal ADHD tendencies from data of 149 mothers of children with ADHD through an online survey. Mothers with ADHD tendencies had poorer mental health, lower education, more ADHD children, and more parenting stressor of "inadequate understanding of the child's disorder from others" than mothers without ADHD tendencies. Their mental health was poorer especially in younger and in those who had more parenting stressors of "difficulties in understanding the child and coping with the child's needs" and "inadequate understanding of the child's disorder from others." Mental health in mothers without ADHD tendencies was related to a variety of parenting stressors and severe ADHD symptoms in the child. Therefore, assessing maternal ADHD tendencies may be necessary to consider effective individualized support measures for mothers of ADHD children.