Happe (1995) found that children with autism could pass the false belief task, representative of theory of mind, at a higher verbal mental age (9.2 years) than that of normal children (4 years). The present study examined which children with autism acquired the theory of mind, delayed or deviant, by asking children to select which box the protagonist would search and to explain verbally how they arrived at their conclusions. Participants were 60 normal children ages 3-6 years and 29 children with high functional autism with above-70 VC (WISC-III) and CA ranging from 6 years 10 months to 12 years 4 months. While some normal children passed the false belief task, they were unable to explain their reasons (level 1). Others passed and could express their reasons (level 2). In addition, in the case of children with high functional autism, all who passed could give the reason correctly, and none displayed reactions belonging to level 1. The discussion compared the intuitive mentalising of normal children with the verbal proposition mentalising of children with high functional autism.