In recent years, research on non-motor symptoms of Parkinson’s disease (PD) has developed from various perspectives, and several studies have been conducted in PD using the Behavioural Assessment of the Dysexecutive Syndrome (BADS Behavioural Assessment of the Dysexecutive Syndrome (BADS)2) in PD has been conducted in Japan and abroad. In Japan, there were several studies using the Japanese version of the BADS for PD from the late 2000s to the early 2010s 5) 6) 8) , but the number of studies has been declining since then.In recent years, research on non-motor symptoms of Parkinson’s disease (PD) has developed from various perspectives, and we conducted the BADS in PD patients with MMSE (Mini-Mental Scale Examination) scores of 24 or more and no obvious dementia symptoms at our hospital. The BADS was conducted in PD patients with an MMSE (Mini-Mental Scale Examination) score of 24 points or more and no obvious dementia symptoms, and a retrospective study showed that 2 patients had an overall score of “impaired”, 3 patients “borderline”, 5 patients “below average”, 18 patients “average”, 3 patients “above average” and no classification of “excellent” or “extremely excellent”. This predicted that PDs would have better temporal judgement, but less ability to plan effective and efficient routes, to check their own behaviour and to plan spontaneously.